13.0 Do Mortars Get a +1 Shift on OP Fire?

[Juiceman]

Mortars are the only bombardment weapons that get to use opportunity fire. Yet there is no specification that mortars receive the +1 column shift that direct fire units get, either on the bombardment chart or in the rules. Do they get this +1 shift?

In my opinion they should get the +1 modifier, OP fire is when a unit is moving, and as such it is venerable to increased casualties due to it being exposed, especially infantry, so if a unit can take extra casualties due to DF do not see why the +1 modifier would not pertain to mortars using OP Fire.  Was under the impression the venerability of the moving unit that the +1 modifier is representing (my interpretation).  Interesting topic.