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In an invoice, the customer/vendor item takes the business area(s) of the expense or revenue posting. If the business area is unique in the document, it is copied into the line item automatically. If there is more than one business area, no value is entered in the customer/vendor item. A transfer posting to the receivables/payables account is carried out
subsequently
The system checks that any business area entered in the customer/vendor item is the same as that in the offsetting G/L account item and issues an error message if this is not the case. You can set the status of this message in Customizing (error message, warning) or even suppress it entirely.
Taxes are always posted without a business area. The system then, at a later date, makes a transfer posting from the tax account to the business areas for the revenue or expense accounts.

Account |
Business Area |
Amount |
Customer/receivable |
0001 |
230.00 |
Revenue |
0001 |
200.00- |
Taxes |
30.00- |

Account |
Business Area |
Amount |
Customer/receivable |
690.00 | |
Revenue |
0001 |
200.00- |
Revenue |
0002 |
400.00- |
Taxes |
90.00- |
