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Posting Invoices 
When you post a vendor invoice, the system has to be able to determine the amounts to be paid to the tax and social security authorities. There are two ways to enable it to do this, depending on the account(s) to which you wish to post the amounts:
1. If you wish to post the tax and social security contributions to your sub-contractor’s blocked account, the system is able to propose automatically the proportion of the invoice to be paid to the sub-contractor’s regular account and the proportion to be paid to the sub-contractor’s blocked account.
2. If you wish to post the tax and social security contributions directly to the authorities, you can use the extended withholding tax functions. This allows the system to calculate the amount for posting to the tax authorities and the amount for posting to the social security authorities, and to allocate these amounts to the respective withholding tax accounts.
You have enabled an amount split for your company code.
You have maintained your vendor master data.
Enter your vendor invoice as usual in Logistics Invoice Verification (MM-IV-LIV). Additionally,
1. When you have entered the purchase document number on the PO reference tab, check that the data contained in fields Start date, End date, and Hours, which has been copied from the purchase order, is correct. If any of the data has changed, for example if the invoice you are entering is not for the full amount and, therefore, only for a proportion of the hours entered in the purchase order, correct the values.
2. Enter a description of the work being carried out in field Work description and the name of the construction site in field Construction site. This information is used for report Document flow of purchase order line items.
3.
If you are posting
a proportion of your invoice to your sub-contractor’s blocked account,
see Posting to
a Blocked Account.
If you are posting a proportion of your invoice directly to the tax and social
security authorities, see Posting to the
Authorities.
The posting of invoices with chain-liability specific fields is only supported in the transactions MIRO (Enter Invoice) and MIR7 (Park Invoice).
