OOTB hybris supports splitting of DEBMAS IDOCs by KTOKD. It means that different IDOCs can be processed with different mapping services. But in case of IDOC contains set of DEBMAS with different KTOKD values, all of them would be processed with same mapping service regardless of real KTOKD value. Unfortunately implementation of proper fix requires core changes in datahub IDOC processing, but there is an easier way to fix that issue with performance trade-off.
Adding any of SAP datahub integration extension in localextensions.xml leads to build error with root cause Extension doesn't specify a path and no scanned extension was matching the name.
If someone uses custom tomcat for hybris, be aware that latest version of Tomcat 8.5.32 is not compatible with all versions of hybris and datahub due to implementation in Tomcat of Java EE v.8 specification(EE 5.3.3), which defines that deployment should fail if the lookup element of an annotation or the lookup-name element in a deployment descriptor entry does not specify a name with an explicit java: namespace. This breakable changes was added in apache tomcat commit.