This basically corresponds to a harness in both the Barrel and Endcap.
The 6 modules contained in an MUR are mapped directly to 6 outputs and 12 inputs on the BOC/ROD.
This falls down for 4 modules on each Endcap. Here 4 "leftover" modules 1 from 4 quadrants are mapped to one harness. This is not yet reflected in the configuration database.