Message type: E = Error
Message class:  FINS_FI_MASS_DATA - Mass Data Handling 
Message number: 155
Message text: You can only accept errors in completed work packages
Your selection does not contain any error messages from a finished work
package.
Error messages that occur only for unfinished, failed or cancelled work
packages cannot be set to accepted.
In order to finish such work packages<(>,<)> find out what the root
cause of the issue is, correct the errors, and start the mass data
activity 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 FINS_FI_MASS_DATA155 typically occurs in the context of mass data processing in the Financial Accounting (FI) module. This error indicates that you are trying to accept errors in work packages that are not completed. Here’s a breakdown of the cause, potential solutions, and related information:
Cause: Incomplete Work Package: The error arises when you attempt to accept or process errors in a work package that has not been fully completed. This could mean that there are still pending tasks or that the work package is in a status that does not allow for error acceptance. Status of the Work Package: The work package may be in a status that does not permit further processing, such as being in a "locked" state or not yet finalized.
Solution: Check Work Package Status: Verify the status of the work package you are trying to process. Ensure that it is marked as completed. You can do
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
FINS_FI_MASS_DATA154 Mark a line for which to show the single messages
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FINS_FI_MASS_DATA153 Previous runs contain no packages to reset
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FINS_FI_MASS_DATA156 Action was only partially executed
What causes this issue?  Your selection contains some error messages that occurred only in unfinished work packages.System Response  The system sets o...
FINS_FI_MASS_DATA157 Set ID &1 is invalid
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.