Error message when reloading the DB

[Johannes_Rudel]

Hello everybody, I hope you can help me. I have two tables A and B that are linked 1: 1. My facts are in table A. I have expanded table A to include a column from table B on "Combine query". Now that I want to reload the DB, the error message always appears in the picture. I have already tried to reload the individual transformation steps, unfortunately without success. It would be great to get an answer. Thanks in advance

[amitchandak]

@Johannes_Rudel , It seems related to the connection. Clear permission under edit transformation and try again.

Open power query and check for any additional error details

[Johannes_Rudel]

Thank you for your prompt reply. I cleaned up the permissions, unfortunately without success. Maybe I have to be more precise: Before I hang the column from table B in A, I can read my DB correctly, but not after the combination. It always loads up to this point and then comes the error shown.