Enable fields in Subsitution OBBH

Goto Tcode - SE11
Table Name - VWTYGB01

Click on change.
Select the field you want to bring in OBBH.
Un-tick the exclude box.

Maintain Fast Entry

Use Tcode - O7E6
Create new variant.
Enter the field from possible fields and use the fast data entry.

Taxes on Customer Advances

Calculate the tax on Customer Advances and give the full amount to Credit Control Area.

Tcode FBKP
Select Special GL
Customer Downpayment
Selecy the Special GL Account and enter output tax clearing as MVA.

Tcode OBXB
Select MVA
Maintain the "Control G/L Account for Advances"

Field Changes after FI Posting

The field should be maintained correctly in the table TBAER.
The table can be maintained in view V_TBAER, calling transaction SM30.

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