posting in item voucher

hi , i am using nav 2009 SQL database,

i want to know what the link between the posting from the item voucher form(#40) and the gen journal line table (#81).

because when posting an error occur that “document no must not be empty in the gen journal line table”.

the gen. journal line table is empty . no records

please advise

Without Document no you can not post any voucher. Kindly enter document no in document no field or you can specify same using running no series in Batch setup.

document no is already filled in all transaction,

but same error

Is there any Empty Entry in That batch ??? Check that also

All entries are correct, but the error is so weird, it said that the document no. is empty in gen journal line, and the item voucher form is linked to the item journal line??