dbimport related problems

Hi There,
 
A little while ago i placed help request on the mailing list in regards
to a dbimport problem I was having basically it would bottle out half
way through the import saying constraint already exists then referencing
to which contraint it exactly was now, what I did was to get rid of the
contraints that were causing the dbimport to fail. Now this worked a
treat and the dbimport completed successfully now whenever I go in to a
section of the program I am writing that uses BEGIN WORK so i.e. trys to
enter a transaction it throws me out with the following error. 
 
"Transaction Not Available"
 
Would anyone be able to tell me why it is doing this, it has only been
since I got rid of the dev database and replaced it with a refreshed
version from the live database.
 
Many Thanks,
 
Scott Edwards


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