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Hola, no es recomendable que ese campo sea modificable en la factura porque se veria afectado el pricing si alguien ingresa erroneamente alguno.
Existen estos exits para billing, una opcion seria grisar ese campo• USEREXIT_FILL_VBRK_VBRP (Module pool SAPLV60A, program RV60AFZC)
This user exit is only called when the billing document is created. It is used to provide the header and the item of the new billing document with deviating or additional data.
• USEREXIT_PRINT_HEAD (Modulpool SAPLV61A, Programm RV61AFZB)
Printing the header line of a billing document can be supplemented or changed.
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