Error Code 900: Transform Map.

[Pradeep Kumar 1]

I get this error while running the Transform Maps in Import Sets and when i tried to analysis on the issue i found that it is not specific related to table. We are doing some multiple checks before updating the record from interface. if any check is failed we are throwing the customized Error to Supplier. So these customized errors are causing the 900 error code while making transform map but not getting how to prevent. 

Thanks in advance for helping...:)

[akasharora]

Could you provide the script via which are using before a record is updated.

Thanks,
Akash

[Pradeep Kumar 1]

Found the Solution .... might be helpful for any one ... 

error = true in onBefore Script causing the issue.