PO transfer in error

HI,

I have one issue where PO changes is not transferred to backend system after netprice is been changed in SRM PO,

the issue is been the account assignment line is changed to 2 from 1 and due to this we are getting the issue of transferring the PO,

Below is the error message

Sum of qty <4> is greater than total qty

please help on this

Regards

Rajesh Rajagopal