Software considering cladding in calculating material thickness


As per my project requirement, No credit shall be given to thickness of integrally-bonded or weld metal overlay cladding in calculating material thickness, required to sustain all primary loads.

My clear I.D is 2750 mm, cladding, which is not to be considered in pressure calculation in 3.2 mm, according I.D to be used in thickness calculation is 2756.4 mm. I entered in this ways, but software calculation is considering n this way and adding cladding thickness in formula, thus required thickness and O.D accordingly. Kindly elaborate is there any option that we do not consider cladding in material thickness calculation?