EXEC Procedure Behave Different In DTS/QueryAnalyzer

Hi,

My DTS package performs the following:
1. 4 transformations to transform data from Sybase tables A,B,C,D to the temp tables in MSSQL
tmpA, tmpB,tmpC,tmpD
2. Next, I have a task to run 4 stored procedures to load the 4 tmp* tables to actual tables A,B,C,D
(so the task is "exec spA, exec spB, exec spC, exec spD".
3. There are 9/26/280/10000 records in the tables A,B,C,D
4. each stored procedure basically checks whether the record in the tmp* tables exist in the actual
table baesd on the primary key and then perform an insert/update.

The strange thing is:
1. All 9 records in the tmpA is loaded to A. Only 17 records from tmpB is loaded to B
2. The same codes "exec spA, exec spB, exec spC, exec spD", if copied to query analyzer,
they all run to completion, ie all 10000+ records are loaded. so there is no pbm with the data.
3. If I "split" the task such that task1 loads A and task2 loads B,C,D (and task2 runs after task1)
now again all data for A is loaded, but 25 records from B is loaded
4. I tried to catch the @@error in the stored procedure for the insert/update statements
but there's no error. Most importantly, the stored procedures run fine in query analyzer

Is there some sort of timeout or buffer issue here that is causing this strange behaviour.

All help is appreciated.

Thanx
Jes