Warning Pvar

Hello,
I am creating a new material in the Caesar Data Base, and I am getting the following warning.
Why?


ALLOWABLE STRESS ITEM ON ELEMENT 10 TO 20
Pvar should betwwen 0.5 an 1.0. This value is reset to 1.0

Now I am working with code STOOMWEZEN so I can use just One temp and one Pressure. I dont know if this have influence.

Thank you,

For the Stoomwezen Code, the "Pvar" entry corresponds to Stoomwezen's "Cm" parameter.