Please maintain settlement materials for all conditions

What causes this issue?

In the agreement (arrangements in Purchasing or
<DS:GLOS.352A2471AAE85CD5E10000009B38F974>agreements</> in Sales and
Distribution) there are
<DS:GLOS.3526C79FAFAB52B9E10000009B38F974>conditions</> for which the
field settlement material cannot be proposed from the condition record
key, because the condition does not refer to a material.
In SD, the settlement material is needed to create a credit memo,
because an item is created with this material.
In purchasing, the settlement material determines the conversion factors
for material-specific unit conversion, because the supplier business
volume is not updated for the material. The settlement material can be
used for later conversions, where necessary. The settlement material is
also used (material short text, account determination, tax
classification) for creating the settlement documents (credit memos and
billing documents).

System Response

You cannot save the agreement.

How to fix this error?

Maintain the agreement material for all conditions.

Error message extract from SAP system. Copyright SAP SE.