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Posting to a Blocked Account 
You have defined your chain liability method.
1. See Posting Invoices, under Procedure.
2. Make sure that the percentage figure is copied over from the purchase order into field Percent.
3.
Select the Amount split tab to view the proposed
split: The system creates two line items, the first being the proportion of
the wages to be paid to the sub-contractor’s regular account and the
second, the proportion to be paid to the sub-contractor’s blocked
account. The system calculates this second line item as follows:
Line item amount x Value in field Percent x General percentage rate for blocked
account postings
4. If you want to pay the second line item from an account that is not your usual house bank account, for example your own blocked account, change the payment method in the second vendor line item. The payment program is then able to determine the account from which you want to make the payment.

You can also change the account when you run report Change Payment Block and Payment Method. (See under To modify the payment method for open vendor items.
5. Continue by posting your invoice as usual.
The Financial Accounting (FI) document shows two line items, as proposed on the Amount split tab. The system automatically fills the Partner Bank Type field in the second line item with the value stored in the Customizing settings of the corresponding Chain Liability method. Therefore, when you run the payment program, the two line item amounts are assigned to two different accounts.
Posting to a blocked account with the chain-liability specific amount split is only supported in the transactions MIRO (Enter Invoice) and MIR7 (Park Invoice).
