No routing for planned order &1; not possible to distribute to MES

What causes this issue?

The system could not determine a
<DS:GLOS.3528EE4BEB4D21BCE10000009B38F984>routing</> that can be used
for production of the planned order &V1&.
In order that a planned order can be distributed to an MES, there must
be <DS:GLOS.3526C467AFAB52B9E10000009B38F974>routing</> or a
<DS:GLOS.3526C3AEAFAB52B9E10000009B38F974>rate routing</> for the
material to be produced. The key of the assigned routing is filled in
the IDoc (PLNAL, PLNNR, PLNTY). In particular, SAP ME needs the routing
key for choosing the routing previously distributed as master data that
you want to be used for producing the order.

System Response

The system terminates distribution of the planned order &V1& even
though, according to the criteria described in <DS:TRAN.DRFF>filter
maintenance</>, it is relevant for distribution to the MES.

How to fix this error?

Check if the prerequisites for automatic determination of a routing are
satisfied.
You have created a routing (transaction <DS:TRAN.CA01>CA01</>) or a rate
routing (transaction <DS:TRAN.CA21>CA21</>) for the material to be
produced.
The type and the number of the routing to be used has been stored in the
<DS:GLOS.3526C38DAFAB52B9E10000009B38F974>production version</> for the
material being produced.
The Customizing settings enable automatic routing determination. Inform
your system administrator about this if necessary.

Procedure for System Administrators

Check the Customizing settings for automatic determination of the
routing
RESET N1
.
Determine the selection ID that is used for the automatic routing
alternative selection. To do so, call the Customizing activity for the
<DS:SIMG.SIMG_CFMENUOLPKOPU5>scheduling parameters</> of planned orders.
Take a look at the scheduling settings for your plant and your order
type, if necessary, to see which selection ID has been set for detailed
scheduling or rate-based scheduling. In the standard system, the
selection ID 01 or 02 is used.
Call the IMG activity for automatic <DS:SIMG.SIMG_CFMENUOLPKOPJF>routing
selection</> and check if there is an entry that matches your master
data for the selection ID determined above, the routing type (N or R),
the routing usage, and the release status. If necessary, add the missing
entry.
For more information about the prerequisites for distributing planned
orders, see the Implementation Guide under <DS:SIMG.MES_INT_BASIC>Basic
Settings</> for MES integration.
You can likewise influence the properties of this message in
<DS:SIMG.SIMG_CFMENOLPFOPJB>Customizing</> and thus suppress it (leave
the message type blank) if it is not relevant to your business process.
In this case, planned orders for which a valid routing cannot be found
in ERP are also distributed.

Error message extract from SAP system. Copyright SAP SE.