3389469 - In Manage Purchase Contracts, Custom Account Assignment is not visible.

When attempting to create a purchase contract using the "Manage Purchase Contracts" app in SAP S/4HANA Cloud, the system displays the following error message:

Error: "Enter a valid account assignment category"
Message Number: ME/063

This issue arises specifically when using a custom Account Assignment Category (AAC) and  Account Assignment Category "Q" cannot be viewed, selected, or accessed within the app

SAP S/4HANA Cloud Public Edition

Account Assignment "Q", Manage Purchase Contracts, App ID F1600A, S/4HANA Cloud, S4_PC, S4_1C, MM-FIO-PUR, Create Purchase Contracts,account assignment category, custom AAC, ME/063, manage purchase contract, SAP S/4HANA Cloud Public Edition, purchase contract creation error, valid account assignment category, Fiori app, standard design, ME31K.  , KBA , MM-FIO-PUR-SQ-CON , Fiori UI for Manage Purchase Contracts , Problem