Message type: E = Error
Message class:  HRPAYDEBAV - HR-BAV (CPS) Error Messages (Germany) 
Message number: 445
Message text: Error while calculating age on key date
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 HRPAYDEBAV445, which indicates "Error while calculating age on key date," typically arises in the context of payroll processing or personnel administration when the system encounters an issue while trying to calculate an employee's age based on a specified key date.
Cause: Missing or Incorrect Date of Birth: The most common cause of this error is that the employee's date of birth (DOB) is either missing or incorrectly entered in the system. Invalid Key Date: The key date used for the age calculation may be invalid or not properly formatted. Data Consistency Issues: There may be inconsistencies in the employee's master data that prevent the system from performing the calculation. System
Configuration Issues: There could be configuration issues in the payroll or personnel administration modules that affect how age is calculated.
Solution: Check Employee Master Data: Navigate to the employee's master data (using transaction code PA30). Verify that the date of birth is correctly entered and
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
HRPAYDEBAV444 No distribution proposals for entitlement &1 and taxation type &2
What causes this issue?  Table P01VA_AUFT does not contain any records for the entitlement and the specified taxation type for the verdict.System Resp...
HRPAYDEBAV443 Error while calculating reduction factor for entitlement &1
What causes this issue?  The reduction factor could not be calculated. Potential reasons for this are: The share based on the length of marriage for t...
HRPAYDEBAV446 Method & not implemented in class &
What causes this issue?  Processing for the pension equalization payment is implemented using a class that is assigned to a <DS:DE.P01_VA_VARGL>...
HRPAYDEBAV447 Type &1 for period calculation is invalid
What causes this issue?  The following types exist for period calculation: Space = calendar days 1 = 30-day method Type &V1& is invalidSystem ...
Click on this link to search all SAP messages.