Transaction control with multiple services

First, please let me know if the following is correct regarding transaction control when using the Write to Multiple Data Store Entities Smart Service.

• If the same entity is accessed by multiple users at the same time, the update executed later will always take effect.

I know that procedures can be used as a method to access tables (entities), but do you know if there is a possibility of inconsistency if a procedure and Multiple Data Store Entities have access to the same table (entity) at the same time.

Is it an anti-pattern to also access by Write to Multiple Data Store Entities for a table accessed by a procedure? This is a question.