ERROR: Master and detail relations are flipped from user specification.
In the mapping, one Source Qualifier transformation has been linked to two Joiner transformations in the same target load order group, and has been specified as the master source in one Joiner transformation and the detail source in the other.
Edit the Joiner transformations so the same Source Qualifier transformation is the master source in both Joiner transformations in the same target load order group.
If you need to keep the Source Qualifier transformation as the master source in one Joiner transformation and the detail source in the other, create a separate target load order group and place one of the Joiner transformations in that second group.