Condition EK01 is missing in pricing procedure A V when creating DP90

dear experts,

I am generating the invoice with the help of DP90,here my issue is in PM side in service order IW51 in header data in customer address we are giving sold to party as xyzzzz and we are saving and this will flow up to DP90,from dp90 it will generate the debitmemo request and generating the billing document,when I am changing the customer as 1233333 in service order IW51, from pm side its doing well but when that flow to DP90 its not generating to debit memo request,its showing error as

Condition EK01 is missing in pricing procedure A V

The condition issued is not in pricing procedure A V

I am not able to understand why this error is coming,what to do to solve this issue,please help me out.