User Specific BU for Unapplied Cash

Hello,

Client wants to put user specific BU when they create Unapplied cash in P03B102. The reason behind this is they want to have a better followup of their cash-flow. The BU can't be put in AAI as they want user to select. Today UC hits balance sheet BU.

I  modified the company's AAI RCUC, put the Business Unit as empty and optional, then through SQL I updated the required BU (MCU) in F03B14

When I ran posting, it went in error as it was looking for the key Customer Resp. BU.419xxx

I emptied the GLC on F03B13 & F03B14 for the transaction, got same error.