Hi All
I tried on development system and it worked. I created a derivation rule and defined two fields that are account_number and usertemp1 as source field. And I defined commitment item as target field.
Using table lookup I derived material group from matnr. Then I created a derivation rule from usertemp1 to commit_item. I entry material group for usertemp1 and I entry commit_item that was created for material group as target field. ( For example,on above post material group A100 ).
Thank you