How to fix SAP error SF391?

What causes this issue? The defined project does not exist in the system. The system issues an error message and will not allow you to continue with this transaction until the error is resolved. System Response Editing cannot be continued.How to fix this error? Define an existing project number. A list of the existing projects can be obtained with the F4 help key.Error message extract from SAP system. Copyright SAP SE.

How To Fix SF391 - Enter an existing project number

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SAP Error Message - Details

Message type: E = Error
Message class: SF - SAPfind: Message Texts
Message number: 391
Message text: Enter an existing project number
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What causes this issue?
The defined project does not exist in the system.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
System Response
Editing cannot be continued.
How to fix this error?
Define an existing project number. A list of the existing projects can
be obtained with the F4 help key.

Error message extract from SAP system. Copyright SAP SE.

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What is the cause and solution for SAP error message SF391 - Enter an existing project number ?

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