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Null Value in a subquery



I have a subquery:

SELECT SUM(Requisicion_Importe) FROM Requisicion
WHERE Requisicion_Contrato = target.[@field:Contrato_ID]

That for some conditions doesnt find results, the problem is that is showing me empty spaces insted of 0 that i need for another calculated field.

Right now i cant use that column because i have something like this 10 - " " = " " , insted of 10 - 0 = 10

Can you help me change my query with proteccion for isnull()


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