After importing camt.054 files into customer payment journal, Settlement type field filled in with 'None' value, which can be incorrect in cases when the peyment line is settled against an invoice. This can cause erroros during posting of this lines.
Applying KB4041922 should resolve this issue.
Having this fix installed is added as a required prerequisite hotfix package
for the 'Payment model mapping to destination ISO20022'.version.10.15 GER configuration.