ubDetailGrid: Prevent error "whereList: null value is allowed only for isNull or notIsNull...
Prevent error "whereList: null value is allowed only for isNull or notIsNull comditions but found in "__MD0" for "equal" condition",
when loading the ubDetailGrid
, which refers to the empty masterField
value. (For example, when opening a form to create a new record) (UBDF-9698)