Q1: How critical is this PTF?
A1: Not critical at all, this CATHW03W is just a warning message, even though the text can be a bit concerning.
Q2: Will it cause CA products not to function?
A2: No in fact, as of today, there is no product currently exploiting this feature
Q3: Or does it only affect the CAMASTER address space?
A3: There is no effect on the CAMASTER address space except to have it displayed.