Withholding tax table taxable amount error

hi,

here successful mexico determination are aggregate wtax for invoicing, erstwhile we request to update the watx array sap is giving an mistake that the taxable magnitude connected each enactment should not transcend the basal magnitude of the invoice, the occupation is that successful bid to cipher the close wtax magnitude the taxable magnitude needs to beryllium 100% of the basal magnitude connected each line

what is the logic successful sap b1 to not fto america prevention the invoice if the taxable magnitude of each enactment is greater that the invoice amount?

hope you tin help

thanks