Difference in object list header data: 101 previously / 321 new

Hi All,

When I try to post a GR against a PO for a serialized component I get the error as given below

Difference in object list header data: 101 previously / 321 new

Message no. IO308

This error is there only when I am using MIGO, but I can do the GR in MB0A.

Does anyone have any idea what this error is?

Regards,

V S