i created new column in RetailStoreTable type Enum (acceptnegativevalue) and type of this enum is (NoYes) as you see here in Retail stores

now i want check this value when i press post statement in open statement form

so i edit main code of post statement for check if total Difference is negative or positive to this code
void clicked()
{
if(Sale_M_totalDifferenceStore.realValue()>=0)
{
super();
statementLine_ds.executeQuery();
element.close();
}
else
{
info ("in this case can't accept negative value you must change case");
}
}
so i need to check (acceptnegativevalue) first befor start my previous code
how can i add this into my code?
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