Message type: E = Error
Message class:  TU - Billing/Scheduling/Budget Billing 
Message number: 750
Message text: Items could not be unlocked because BB plan was already deactivated
You cannot unlock any due dates because the budget billing plan has
been deactivated.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message TU750, which states "Items could not be unlocked because BB plan was already deactivated," typically occurs in the context of SAP's Business Planning (BB) or similar planning modules. This error indicates that the system is unable to unlock certain items because the associated planning process or plan has already been deactivated.
Cause: Deactivation of Planning: The primary cause of this error is that the planning version or the business plan has been deactivated. When a plan is deactivated, it can no longer be modified or have items unlocked. Incorrect Process Flow: The error may also arise if there is an attempt to unlock items in a sequence that is not allowed due to the current status of the planning version. User Permissions: Sometimes, the user may not have the necessary permissions to unlock items in a deactivated plan.
Solution: Reactivate the Planning Version: If possible, reactivate the planning version or business plan
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