FMN0 - Changing Commitment item for FI documents

Dear FM experts,

I am trying to correct my FI documents posted with wrong commitment item, now want to change the account assignment with correct commitment item. when I am executing the FMN0 for FI documents am getting below error - Account assignment change with document creation! (Msg No - FMUP127).

Provided the conditions are full filled,

FMDERIVE - Strategy - Overwrite with new value if new value is not empty

Attributes - Rule for line item 1 - Check box ticked for End Strategy

Rule for line item 2 - Check box ticked for all three End Strategy

If I remove any of these conditions my new commitment item is not derived(found through trace). Request your valid suggestions.

Regards,

mohdsams