Enter a valid value for the settlement type

What causes this issue?

The system found a <DS:GLOS.settlement_type>settlement type</>
settlement type in the <DS:GLOS.settlement_rule>settlement rule</>
which either does not exist or is unsuitable for the sender.

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?

If possible, enter a suitable settlement rule. Remember that the rules
for preliminary settlement ("PRE") of
<DS:GLOS.capital_investment_measure>capital investment measures</> are
different from those for period settlement ("PER") of other settlement
senders. Periodic settlement only makes sense for capital investment
measures. They must not have any "PER" rules.
To enter an <DS:GLOS.investment_profile>investment profile</> (in the
control data for an order or WBS element) or to remove it. However,
first delete the PER or PRE rules (in the settlement rule) and er zu in
internal orders, you can first change the investment profile and then
adapt the rules before you save.

Error message extract from SAP system. Copyright SAP SE.