I have some applications where the Valid_If condition was written as: IN([_this], SELECT(TableName[ColumnName], condition)). These expressions worked fine but when we try to modify them the error “Unable to find column _this” appear. The solution seems to be just to remove the IN formula and write: SELECT(TableName[ColumnName], condition).
Will the first formulation remain valid or do we need to upgrade all formulas written in the first way? Thanks!