How To Fix IP156 - An error occurred when calculating maintenance plan &1

IP156 - Overview

• Message type: E = Error

• Message class: IP - Messages for preventive maintenance

• Message number: 156

• Message text: An error occurred when calculating maintenance plan &1

What causes this issue?

As maintenance plan &V1& was being calculated, the following error
occurred:
You are calculating this maintenance plan in the time period from &V2&
to &V3&. The package that is being used in this time period for
scheduling, &V4&, no longer exists in the current maintenance task list
that was assigned in the maintenance item and therefore cannot be
calculated. The package was either deleted or included in another
maintenance task list that does not use this package.

System Response

The system cannot carry out calculations. As of Release 4.6C (or as of
Release 4.0 with note 186734), when the system calculates maintenance
plans, it takes into account the existing maintenance calls in the
database, therefore including the package that is based on this
appointment. If there is no such package for the point in time in which
the calculation for the valid maintenance task list is made,
calculation is terminated.

How to fix this error?

Make the calculations for maintenance plan &V1& in a time period in
which only the packages that are currently valid (current maintenance
task list in the maintenance item) result in appointments.

Procedure for System Administrators

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message IP156 - An error occurred when calculating maintenance plan &1 ?

  The SAP error message IP156, which states "An error occurred when calculating maintenance plan &1," typically occurs during the execution of maintenance planning functions in the SAP system. This error can arise due to various reasons, and understanding the cause is essential for finding a solution.
  Possible Causes:
  
  Data Inconsistencies: There may be inconsistencies or missing data in the maintenance plan or related master data (e.g., equipment, functional locations).
  
  Configuration Issues: Incorrect configuration settings in the maintenance planning module can lead to calculation errors.
  Missing or Incorrect Parameters: Required parameters for the maintenance plan calculation may be missing or incorrectly set.
  System Performance Issues: If the system is under heavy load or if there are performance issues, it may lead to errors during calculations.
  Authorization Issues: Lack of proper authorizations for the user executing the maintenance plan calculation can also trigger this error.
  
  Solutions:
  
  Check Maintenance Plan Data: Review the maintenance plan for any inconsistencies or missing data.