Message type: E = Error
Message class:  HRGB_GBRTI - Messages for RTI 
Message number: 013
Message text: Date of birth is mandatory
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 HRGB_GBRTI013 indicates that the date of birth is a mandatory field that has not been filled in. This error typically occurs in the context of employee data management within the SAP Human Capital Management (HCM) module, particularly when creating or updating employee records.
Cause: Missing Date of Birth: The primary cause of this error is that the date of birth field is left blank when it is required for the operation being performed (e.g., creating a new employee record or updating existing employee information). Configuration Settings: In some cases, the system configuration may enforce mandatory fields that require a date of birth to be entered for specific processes or reports.
Solution: Enter Date of Birth: The most straightforward solution is to ensure that the date of birth is entered in the relevant field. Navigate to the employee's personal data screen and fill in the date of birth. Check for Required Fields: Review
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
HRGB_GBRTI012 Employee &1 must start with an Alpha character
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRGB_GBRTI011 Employee Surname is mandatory
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRGB_GBRTI014 Gender is mandatory
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRGB_GBRTI015 Passport number has invalid characters
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.