Invalid liability account. Liability account cannot be created on interproject AP invoice

Summary: We are using interproject billing where the customer invoice is created for a legal entity in one BU, the corresponding AP invoice is then created for a legal entity in another BU. In the Common options for the receiving BU the default liability account is assigned to LE 1. But the interproject AP invoice is for LE 2. I have created intercompany balancing rules between LE 1 and LE 2, I have also verified that he receiving supplier is the one listed in the manage intercompany customer supplier association. Still the liability account cannot be created. Is there still