SAP Message USMD2024 - Ent.type &2, UI element &1: Attribute &3 has invalid values for checkbox

Diagnosis You have assigned attribute &V3& to UI element &V1&. However, attributeV3 has non-boolean values as fixed values or master data (values otherthan X' and ' '). This means that you cannot assign it to UI elementV1 with type checkbox. Procedure Assign UI element &V1& an attribute that has Boolean values ('X' and '') as fixed values or master data.