DI Inability to update a payment of type "Account"

Hi

I having problems when trying to update a payment of type "Account" via DI API, the following error message is displayed: "A valid Card Code must be insert".

Dim oPago As SAPbobsCOM.Payments
oPago = oCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oIncomingPayments)
oPago.GetByKey(123)
oPago.Reference1 = "Hola"
lRet = oPago.Update()

Please help

Regards

Jésica