Change partner funtion at invoice

Question: I've tried with t-code VOPA to change partner funtion at invoice with non active "Not changeable" field.
But it didn't work.


Am i missed any setting and customizing?
Please your advise.
Thank you.

Answer:
hi,
what is the message thrown ??

regds

Answer:
No message.
It shown ok, but still not changeable.
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