When a financial dimension value is set as a default dimension for your revenue account it will not appear on the free text invoice in the lines tab to inform the user that it will be used. However when you post, the financial dimension value does appear on the voucher. 

It cause the issue what you see is not what you get, which affect our business analysis report.

The system should auto put the default dimension of the revenue account into free text invoice line, or treat it as blank value when posting free text invoice.