Customer Change in Nav 2009 sp1 posted sales invoice

manosh_mm

One of my customers facing a problem that some of their posted invoices having different customer in the first line. All other lines having the same customer which is there in the invoice header. This is not happening in all invoices.

Please give some idea to over come this problem.

mohana_cse06

May be some customization must have done..
Please check..

manosh_mm

Thank you for your reply, I am new to that project, actually it was implemented by another customer, they have done huge customization in that project. I was also thinking as you said. But my doubt is it happening once in a while only.