Message type: E = Error
Message class:  PPESTATUS - Messages: iPPE Status Management 
Message number: 020
Message text: Preconditions for status ID & have been deleted
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The SAP error message PPESTATUS020 indicates that the preconditions for a specific status ID have been deleted. This typically occurs in the context of Production Planning and Execution (PP/PE) when the system is trying to process a status change for a production order or a related object, but the necessary preconditions that were previously defined are no longer available.
Cause: Deleted Preconditions: The most common cause is that the preconditions associated with the status ID have been deleted or are no longer valid. This can happen if the configuration has been changed or if the relevant master data has been modified. Configuration Changes: Changes in the status profile or the status management configuration can lead to this error if the preconditions are not properly maintained. Data Inconsistency: There may be inconsistencies in the data related to the production order or the status management setup.
Solution: Check Status Profile: Review the status profile associated with the production
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