Application for planned order &1 changed by BAdI from SNP to initial

What causes this issue?

In SAP R/3, the indicator <LS>Create Planned Orders as SNP Planned
Orders</> can be set when an integration model is activated for planned
orders (transaction CFM2). If the indicator is set, SAP APO creates an
SNP planned order from a planned order transferred from SAP R/3, which
fulfills <DS:NA./SAPAPO/RRP540>specific prerequisites</>. If the
indicator is not set, SAP APO automatically creates a PP/DS planned
order.
The <DS:SIMG./SAPAPO/DM_SNP_FILT>BAdI /SAPAPO/DM_SNP_FILT</> can be
used to change the system behavior that is defined by the indicator
described above. This BAdI is called up in SAP APO inbound.
For planned order &V1&, the application was changed from SNP to
initial by the BAdI.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.