Message type: E = Error
Message class:  HRPADRUREPORTS - HR-RU: message class for HR RU reports 
Message number: 256
Message text: The PLTAXRUN external ID provider can not be changed cause already in use
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 HRPADRUREPORTS256 indicates that there is an issue with changing the external ID provider for the PLTAXRUN (Payroll Tax Run) because it is currently in use. This typically occurs in the context of payroll processing where the system is trying to modify a configuration that is actively being utilized.
Cause: Active Payroll Processing: The most common cause is that there is an ongoing payroll run or a related process that is using the current external ID provider. Configuration Lock: The system may have a lock on the configuration settings due to the active use of the PLTAXRUN. Dependencies: There may be dependencies or references to the current external ID provider in other configurations or processes.
Solution: Check Active Processes: Ensure that there are no active payroll runs or related processes that are using the PLTAXRUN. You may need to wait until these processes are completed. Review Configuration: Check the configuration settings for the PLTAXRUN
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
HRPADRUREPORTS255 Error appending new Organization &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRPADRUREPORTS254 Data type of field &1 (T5F99FF) is not compatible with form field
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRPADRUREPORTS257 Check wage codes exist in view V_T7RU_99FF for form 4-FSS
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRPADRUREPORTS258 The amount field &1 for EE &2 has different splitting than charact.fields
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.