Modificar campo división en documento contable

Interesante consulta que me gustaría inmortalizar en nuestro sitio web.

Necesito dejar modificable el campo división en una contabilización de un documento.

Lo agregue en el customizing:
SPRO - Gestión financiera - Parametrizaciones básicas de Gestión financiera - Documento - Posición de documento - Definir reglas de modificación de documentos --> Campo BSEG-GSBER
La contabilización es una imputación deudora.
Pero no me esta dejando modificarlo una vez contabilizado

SAP ha respondido a la nota que envió un cliente:

03.02.2009 - 23:56:13 CET - Reply by SAP
Hello ,
Please kindly review the following information: -
The business area (BSEG-GSBER) field cannot be changed in posted FI documents via trans FB02. This is to prevent serious data inconsistencies in the R/3 system. Even if there is an entry for BSEG-GSBER in table TBAER via trans OB32, the business area field will not be modifiable via trans FB02, i.e., working as designed.
This is explained in attached notes:
0042615 - Substitution in FI
"In addition to accounts and amounts, the following fields, for example, are critical and must not be substituted:
GSBER: this could lead to inconsistencies with modules AM, CO and MM, since the business area is also used in these modules."
and 0040659 - Can GSBER be changed?
"GSBER has an incorrect Modif3 value in table TCOBX. It should generally not be possible to change the GSBER field.
Only the recurring entry original documents are an exception in this respect. Modif3 in table TCOBX is 001, which means that the GSBER field can be changed via document change rules."
Best Regards,
Cintia Marangon
Support Consultant FI
SAP Active Global Support – Financials

Fuente: mundosap.com/foro/showthread.php?t=28153