Message type: E = Error
Message class:  HRRSM00 - Process External HR Master Data 
Message number: 205
Message text: External action is not assigned to an internal action
The external personnel action type has not been assigned to an internal
personnel action.
This check only encompasses Hiring, Leaving and Re-Entry actions. As
the employment status of the employee has been changed by these
actions, infotype 0000 must be updated.
The data could not be processed.
Assign the external action type to an internal action in the IMG, under
'External Personnel Action Types'.
You can delete any data that you have already sent by using the
'Reorganize' function.
Attempt to send the data again.
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 HRRSM00205 indicates that there is a mismatch between an external action and an internal action in the context of SAP HR (Human Resources) module, specifically in the area of personnel administration or organizational management. This error typically arises when the system is trying to process an action that has not been properly configured or linked to an internal action.
Cause:
Configuration Issues: The external action you are trying to use is not assigned to any internal action in the system. This can happen if the configuration for the actions in the system is incomplete or incorrect. Missing Assignments: The necessary assignments between external and internal actions may not have been set up in the system. Custom Development: If there are custom actions or modifications in the system, they may not have been properly linked to the standard actions.
Solution: Check Action Configuration: Go to the transaction code SPRO (SAP Reference IMG). Navigate to Personnel
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
HRRSM00204 Invalid combination of local personnel number &1 and HR personnel no. &2
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRRSM00203 Posted personnel action type is invalid
What causes this issue?  The external personnel action type is invalid.System Response  The data could not be processed.How to fix this error?  You ca...
HRRSM00210 Hiring action successfully completed
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRRSM00211 An employee already has this local personnel number
What causes this issue?  An employee with this local personnel number has already been hired.System Response  The employee cannot be hired. The data t...
Click on this link to search all SAP messages.