Change Account Group (BU_GROUP) in ERP --> CRM replication

Hi experts,

We are running CRM 7.02.

Customer has a requirement to change the account group in CRM, between 2 account groups in different number ranges.

They currently do this via XD07 in ERP, however, the changes do not replicate fully to CRM.

(CRMM_BUT_FRG0041-ACCOUNT_GROUP is updated by middleware, but BUT000-BU_GROUP is not)

We are thinking to use BADI BUPA_INBOUND to make an enhancement in CRM that will force the account group to be changed in field BUT000-BU_GROUP.

We understand that the account group will no longer align with the assigned number range.  This is acceptable from customer perspective.

Are there any other issues that we should be concerned about or made aware of ?  Any other customers facing similar requirement / experience ?

Thanks.