DIXF error while get staging data

I am getting below error for one of my entities when i am copying from Source to Staging table.

Error occurred while doing bulk copy from temp table to entity table-Conversion overflows.

When I am checking in debugger when executing below line its going to catch [s] \Classes\DMFGenerateSSISPackage\generateStagingData 613 returnRec = dmfEntityProxy.MigrateEntity(helper);

Not able to find out whats the exact cause. All variables are having loaded with data in this method. Not sure how to resolve this.

Anyone found similar issue before???