Scenario - While adding A/P Invoice for Asset item, the error "Error - No GL account selected for Asset account in Business partner master Message (3518-13)
Awaiting your replies
You need to map the control account of that vendor(business partner).
->Open the respective Business Partner master data
->Under accounting tab
->Under General tab
->Control accounts (will be indicated with ... button),on opening this
->You will be prompted to map the control accounts
^ Down Payment Payables
Here you need to map the Asset account which also must be a control account(control account option should be checked in the chart of accounts).
Pls do check in the test system,understand the behavior of this account by booking ap invoice and payment,then proceed in the live system.
Hope this is helpful