Account Genarartor issue in iprocurement

 We are creating a requisition in procurement and once the default charge account is generated we are editing the segments and trying to create requisition with new charge account but it is failing and the new charge account what we entered is missing from procurement screen after we click next.
Symptoms: This is happening after RUP7 patching

Error Message: Charge account is invalid. please contact purchasing support.

Before RUP7 [Earlier version], we too get error message saying the charge account is invalid but the charge account never goes off from the screen and we are able to click next and next time it will get validated.