Due date being paid error

SOLVED

We are getting the following error "Due date being paid" when we try and match 2 entries in Sage X3 version 6.5 Patch 30.

The customer in question has  a Bill-To and a different Pay-To and we are now trying match the Invoice Transaction to the GL Transaction that was automatically generated by X3 when the Bill To Customer paid.

Any Ideas why we would be getting this error and how can we resolve.