Purchase invoice error

Hi. I’m a very new NAV user. When issue a purchase invoice the system says : “Chargeable must be equal to ‘No’ in Job Journal Line: Journal Template Name=, Journal Batch Name=, Line No.=0. Current value is ‘Yes’” Not all the time. I’ve checked all Gen. Prod. Posting group set up - they all the same. Invoice issued from purchase order. Please help!