An ODBC error occurred, but no error information

SLQ 2008 R2
NAV 4.0 SP3
Scenario: Sales-post is called by a document, in codeunit 22, the insertitemledgerentry function is going into error on a random document line when it is called by itemqtyposting function. (although it's always the same line in a document, no relation between the different lines that give the error is detected)

Error:
"An ODBC error occurred, but no error information could be retrieved.
Contact your system manager."

And I can't find anything that might give me more information, no erors in eventvwr or sqllog.

client montior shows me this:

Item ledger entry:[??][item ledger entry no][item no.],[date],[sourcetype (customer) ],[Source No],[location code],[quantity],[quantity remaining], ...

This one works: previous lines aswell that are applied (this one isen't, see remaining quantiyt -6.0000)
exec sp_execute 99,20831957,'B7167','2012-06-13 00:00:00',1,'12270','SH212009290','','NEWWHS',-6.00000000000000000000,-6.00000000000000000000,0,0,1,'','',0,1,0,'','','FR','','2012-06-13 00:00:00','A1223-0166','','','S-SHPT','','',1.00000000000000000000,'PC',0,'','','',0,'203',0,'','','',0,'1753-01-01 00:00:00',0,0,0,0,'','','','1753-01-01 00:00:00','1753-01-01 00:00:00',''

This one does not work, 
exec sp_execute 99,20831958,'B7189','2012-06-13 00:00:00',1,'12270','SH212009290','','NEWWHS',-1.00000000000000000000,0,0,0,0,'','',0,1,0,'','','FR','','2012-06-13 00:00:00','A1223-0166','','','S-SHPT','','',1.00000000000000000000,'PC',0,'','','',0,'203',0,'','','',0,'1753-01-01 00:00:00',0,0,0,0,'','','','1753-01-01 00:00:00','1753-01-01 00:00:00',''

Steps taken:
Compile everything again and synchronise users.

I'm at a loss, has anyone seen a similar error and/or behaviour, or does anyone have suggestions to try some steps?