Question:
Hi,
a) If production order quantiy is 100 nos, I make production of 50 nos and confirm only 50 nos .
In the next MRP run what would happen to the left out 50nos? will there be a production order with 50 nos still shown as balance to be produced?
b) What is the difference between confirmation(production order) and backflush using a production order?
Pl.clarify PP gurus...
Regards
JJK
Answer:
Hi,
a) - The remaining qty of the production order will still be displayed and MRP will expect it to be made. If the confirmed 50 PCs are the only PCs that you are going to make do 2 things.
1) be sure to tick FINAL CONFIRMATION and CLEAR OPEN RESERVATIONS within the production confirmation. This will release all remaining reserved materials so that they can be reserved for other orders.
2) Technically complete the production order. This will remove the production order from the display and from MRP.
Remember, if there is still demand for 100PCs MRP will recreate a planned order for the remaining 50PCs.
b) - A production confirmation tells the system what has been made (output) from the production order. A backflush tells the system what has been used (input) in order to make that output qty. You either know the exact amount of raw materials that have been consumed and for these you do an active goods issue. Some materials though you cannot count e.g. water, ink, etc. (items that are in small quantities) so you identify these as backflush materials. When you do a production confirmation the backflush items are consumed (backflushed) as per the BOM. You will never see a variance for backflushed items.
Mark
Answer:
Hi JJK,
With regard to a - If you confirm only 50, yes the production order will still exist and be seen by MRP. In transaction md04 you can quickly test this to see what MRP will see. This order will only go away if the full quantity is confirmed or the order is closed (either closed status, deleted or technically completed).
b - The differences between a confirmation and backflush are many. They really aren't close to the same thing. A backflush is initiated by a confirmation to perform the goods issue. If you did not backflush you would have to perform the goods issue in a seperate step (either in the goods movement button within the confirmation (co11n) or mb1a).
I hope this helps,
JLW
Hi,
a) If production order quantiy is 100 nos, I make production of 50 nos and confirm only 50 nos .
In the next MRP run what would happen to the left out 50nos? will there be a production order with 50 nos still shown as balance to be produced?
b) What is the difference between confirmation(production order) and backflush using a production order?
Pl.clarify PP gurus...
Regards
JJK
Answer:
Hi JLW and other PP guru's
Thank you very much for the replies & answers.
I have one more doubt , should i do both confirmation and backflush to a production order, or one of them is enough! after production is over.
In otherwords ,when confirmation is done and when backflush is done, are both of them required for completing production entry,after production?
Pl.clarify
Regards
JJK
Answer:
Hi JJK,
Typically the only way to backflush is to do it via the confirmation. If the components and work center are setup correctly when you perform the confirmation it will automatically do the backflush. They do not need to be two seperate steps (though they can be). JLW
should i do both confirmation and backflush to a production order, or one of them is enough! after production is over.
In otherwords ,when confirmation is done and when backflush is done, are both of them required for completing production entry,after production?
Answer:
Hi JLW,
I have a doubt on in-house production time. I have the total processing time in mins(5 mins) for a material , how can i represent it in in-house production in days? when is it lot-size independent?!
What happens if i don't maintain in-house production time in MM? How basic dates will be determined? Should i maintain in-house production time ?
Pl.clarify
REgards
JJK
Answer:
You really can't represent 5 min in the in-house production field. It should probably be a 1 (day). This is all relevant for planning so you have two options. If you enter 1 day and then choose a scheduling parameter of 1 when running MRP it will use 1 day as the lead time. If you use a 2 for the MRP scheduling parameter it will read the routing to determine the length of time. Of course this will make MRP run faster however your planned orders are scheduled more accurately and the scheduling considers the quantity being run.
If you leave the in-house production time blank - I'm guessing it will assume 1 day - I am not sure so you will need to test it and see.
Regards,
JLW
Hi JLW,
I have a doubt on in-house production time. I have the total processing time in mins(5 mins) for a material , how can i represent it in in-house production in days? when is it lot-size independent?!
What happens if i don't maintain in-house production time in MM? How basic dates will be determined? Should i maintain in-house production time ?
Pl.clarify
REgards
JJK
Answer:
Hi JJK,
2 things. First, as JLW said, when you perform a production confirmation the backflushing of materials for the confirmed operation and all those above in the routing, up to the previously confirmed operation, is activated immediately. However, the backflushing may fail for numerous reasons so you should periodically check COGI to see the failed backflush attempts and use the messages to resolve the problems.
Secondly, if you are able to quote 5mins as your production time the in-house production time will not be detailed enough for you as this works in multiples of days. Be sure to add capacity and scheduling information to your work centres/resources and then add planning rates to your routings/master recipes. When you run MRP use a scheduling parameter of 2 and your planned orders will be scheduled correctly instead of just in 1 day slots.
Hope it helps
Mark
Answer:
Hi,
As JLW suggested that same operation can be done in several machines running in parallel. How do I create a work center with several machines together, where to find the split in work center screen? secondly how the routing will be ? The routing will carry the workcenter which presents all the machines and system would plan allocating the operation to all the machines in the work center? what data to enter in routing and where?
Pl.clarify
Regards
JJK
Answer:
Hi JJK,
What do you want it to do? Are you hoping to schedule the order per machine or per work center? Within the work center you can define the machines (Capacities - under the capacity tab click on the Capacity button) thus defining the available capacity based on the number of machines. Within the routing (under operation details) you can define the number of splits so it schedules the order based on the parallel execution of the operation.
When the order is created it will schedule based on the capacity defined in the work center and the splits defined in the routing along with your other standard values.
Also, the PP help under the SAP Library has quite a bit of information and examples with regard to this topic, don't shy away from it.
JLW
Hi,
As JLW suggested that same operation can be done in several machines running in parallel. How do I create a work center with several machines together, where to find the split in work center screen? secondly how the routing will be ? The routing will carry the workcenter which presents all the machines and system would plan allocating the operation to all the machines in the work center? what data to enter in routing and where?
Pl.clarify
Regards
JJK