Message type: E = Error
Message class:  HR_SE_PA_PROXY - Message Class for PA Proxy 
Message number: 018
Message text: Mandatory field &1 is not specified
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message HR_SE_PA_PROXY018 indicates that a mandatory field, represented by &1, has not been specified in the context of a process related to personnel administration (PA). This error typically occurs when trying to execute a function or transaction that requires certain mandatory fields to be filled out, but one or more of those fields are missing.
Cause: The error is caused by the absence of required data in the input fields when calling a function module or executing a transaction related to personnel administration. This could happen due to: Incomplete Data Entry: The user may have missed filling out a required field in a form or transaction.
Configuration Issues: The system may not be properly configured to handle certain data inputs, leading to mandatory fields not being recognized. Custom Development: If there are custom programs or enhancements, they may not be handling mandatory fields correctly. Data Migration Issues: If data was migrated from another
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
HR_SE_PA_PROXY017 Start date is greater than End date.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HR_SE_PA_PROXY016 &1 &2 is not valid.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HR_SE_PA_PROXY019 No results found for the specified input
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HR_SE_PA_PROXY020 No rank assignments found for employee ID '&1'
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.