Do not add and remove columns simultaneously in a single modify custom listing save operation

Recommendation: Do not add and remove columns simultaneously while modifying public or private custom listings in a single save operation. Instead, custom listings should be modified in a two-step process. For example, first remove the desired columns and save the custom listing. Then, you can go back and modify the listings to add any desired columns.

Rationale: Custom listings become unreliable when columns added and removed simultaneously from one or more tables as part of a single modify custom listing operation.

Additional information: We recommend that you verify the modified columns along with the data when you use the Test Data feature.