Incomplete NAS process

Hi, I’am trying to do reporting using NAS and Timer. I have designed a singleinstance codeunit which navigates a table and for each line produces a report. When I run this codeunit from Navision all are Ok. When I run from NAS some lines are printed Ok and the rest remain. The NAS runs as a service which has not been stopped. Is there any time limit which I don’t Know or what else to imagine !