How To Fix MPN01056 - MPN concatenation is active for &1 material types

MPN01056 - Overview

• Message type: E = Error

• Message class: MPN01 - MPN Message: Material Master / customizing

• Message number: 056

• Message text: MPN concatenation is active for &1 material types

What causes this issue?

You tried to deselect the <ZK>Activate Inventory-Managed MPN</> checkbox
in the
<DS:SIMG.MPN_CONV_EXIT>Specify Settings for Inventory-Managed MPN</>
Customizing activity.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

The system will not let you deactivate the inventory-managed MPN
functionality as MPN concatenation is currently enabled for the
following material types:
&V2&
Note that a maximum of only 10 records can be displayed here. To view
the complete list of material types for which concatenation is enabled,
perform the following steps:
Execute transaction <NP>SE16</>
On the <LS>Data Browser: Initial Screen</>, specify the table name
<NP>T134</> and choose <LS>Table Contents</>
On the <LS>Data Browser: Selection Screen</>, set the value of
<LS>CONCTD_MATNR </>field as <LS>Not Equal to</> ' ' (Space) and choose
<LS>Execute</>
The system displays all material types for which concatenation is
enabled

How to fix this error?

Proceed as follows:
In Customizing for <LS>Logistics General -> Material Master -> Basic
Settings -> Material Types -> </>
<DS:SIMG.SIMG_CFMENUOLMSOMS2>Define Attributes for Material Types</><LS>
</>, choose a material type for which concatenation is enabled
For the material type, select <ZK>Disable</> in the
<DS:DE.CONCTD_MATNR>Concatenated Mat No.</> field

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MPN01056 - MPN concatenation is active for &1 material types ?

  The SAP error message MPN01056 indicates that the MPN (Material Part Number) concatenation is active for a specific material type in your SAP system. This error typically arises when there is an attempt to process materials that are configured to use MPN concatenation, but the necessary settings or data are not correctly configured.
  
  Cause:
  
  MPN Concatenation Active: The error suggests that MPN concatenation is enabled for the material type specified in the error message. This means that the system expects a specific format or structure for the MPN.
  Missing Configuration: There may be missing or incorrect configuration settings related to MPNs in the system.
  Data Issues: The material master data may not be correctly set up to support MPN concatenation, such as missing MPN data or incorrect relationships between materials and their MPNs.
  
  
  Solution:
  
  
  Check MPN Configuration:
  
  Go to the configuration settings for MPN in your SAP system. This can typically be found in the IMG (Implementation