Dear Christian,
Can u plz provide your modelling details at stage of transformation level mapping between ROCANCEL (Datasource) with 0RECORDMODE (DSO).
ROCANCEL which is coming from Data-source(2LIS_11_V*) need to map with 0RECORDMODE of DSO.
Generally you can't see 0RECORDMDE at Transformation level. You need to select different Rule group at transformation and map 0RECORDMODE with ROCANCEL.
When ever Cancellation happen at ECC side, datasource picks cancelled document with 'X' image and same populates to DSO level. then respected cancelled sales doc gets deleted automatically at DSO level. This si because of 0RECORDMODE functionality.
Best wishes,
Vijay