How to save the work order firm plan if system shows ‘Invalid Account Code!’ ?

Cause: System will not allow the user to process Work Order Firmplan with new item series if the item series is not mapped in item account determination with the account code and cost center code. System will show the following error ‘INVALID ITEM TYPE’ or ‘Invalid Account Code!’.
Remedies:
This will require support from Proteus Support team
User should map the new item series, SA tran type and and all item series with the Work Order Firmplan account code in item account determination.
Item Account Determination master,can be navigated in Finance->Finance Setup-> Masters->Item Account Determination.