Definition of Parameter Value

Question: For Parameter ID SD_VARIANT_MAINTAIN, there is a Parameter Value "A".

Where I can find the definition of the Parameter Value ?
For example, what is "A" stand for ?

Thanks a MILLION for your help.

Answer:
By searching the Parameter ID in the OSS notes, have the following findings :

As of Release 4.5A, a prerequisite for the setting and administration of display variants in sales reports is the authorization parameter 'SD_VARIANT_MAINTAIN'.
If this parameter contains the value 'A', you can store both standard and user-specific variants.
If the value is 'X', you can only store standard variants.
If the value is 'U', you can only store user-specific variants


Is there any 1 place, document ALL available Parameter IDs and the definitions of corresponding Parameter Value ???
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