Can we buy BC Team Member license without buying Premium or Essential license?
No you cannot, And it does not make any sense either:
Having Team Member licenses only, will result in having a lot of orders and journals... that can never be posted.
For that is the essential difference between Team Members and full licenses: Team Members can only prepare... not actually post. (besides Time Sheets... but they are posted through the Job Journal)
You will always need at least one Essential or Premium license in order to post the documents and journals prepared by Team Members.
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Best regards,
Hans