Message type: E = Error
Message class:  TR - Change and Transport System 
Message number: 218
Message text: HEAD-SYST entry in TADIR cannot be modified
The following entry could not be modified:
TADIR-PGMID  = "HEAD"
TADIR-OBJECT = "SYST"
The function was canceled.
Correct your entry.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message TR218, which states "HEAD-SYST entry in TADIR cannot be modified," typically occurs when there is an attempt to modify an entry in the TADIR table that is not allowed. The TADIR table is a key table in SAP that stores information about the objects in the system, including their transport status and other metadata.
Cause: System Objects: The error often arises when trying to modify system objects or entries that are predefined and protected by the system. These entries are usually related to standard SAP objects that should not be altered. Transport Request Issues: It can also occur if there is an issue with the transport request, such as trying to include or modify an object that is not allowed to be transported. Authorization Issues: Lack of proper authorizations to modify certain entries in the TADIR table can also lead to this error. Incorrect Configuration: Sometimes, incorrect configuration or manual changes
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