Limit the number of lines in billing document

Hi Experts,

The billing document has 359 line items and while going for accounting each line is added with three accounting lines and causing problem of more than 999 lines.

The billing is created based on combination of delivery documents. The deliveries are created based on Scheduling Agreement.

There is a logic built already to restrict the number of lines.

where else I can check like any code is written to restrict the number of lines in billing document??

1. Have checked Country specific features but there is no limit maintained.

2. Checked copy controls, there also no logic written to restrict the number of lines.

Thanks

Geetha