[Cristiana]

muchas Gracias el problema era que estaba usando solo una estructura al parecer son dos las que se deben de usar
en la funcion en la parte del function modul documentation encontr eso
por si a alguien le sirve.


At the moment, you can use the BAPI to store enhancements in the following structures:

VBAK : An enhancement to header data requires an append structure to BAPE_VBAK and an enhancement to structure VBAKKOZ.
VBAP : An enhancement to item data requires an append structure to BAPE_VBAP and an enhancment to structure VBAPKOZ.
VBEP : An enhancement to schedule line data requires an append structure to BAPE_VBEP and an enhancement to structure VBEPKOZ.
VBKD : If you are using an enhancement for header data, you must add an append structure to BAPE_VBAK. You also need to enhance structure VBAKKOZ. If it is for item data, you need to add an append structure to BAPE_VBAP. You must also enhance structure VBAPKOZ.
If you also want to work with checkboxes, each X-structure must also contain an append structure.