I am trying to migrate some data from one SF account to another and after failed effort at using the Excel connector moved on to try the APex Data Loader with Data Export data from Account A. WHen I tried to use the Data Loader to insert the Account data object into Account B I was getting 100% "invalid cross reference id" errors. Upon further inspection of the error file I notice some "insufficient access rights on cross-reference id" errors as well. I googled and came across a thread on here that the problem may be related to OWNERID field. So I removed that field form the mapping and near 100% success. Alas I am still getting the "insufficient access rights on cross-reference id" errors. The other error has vanished.

Does anyone have any idea what could be done to resolve this as no one at SF seems to have a clue?