I would have thought that after 2 years of constantly following topics on the forum that you would know:
a) Nothing is ever thrown on the mainframe: errors are issued/displayed
b) The only time something Bends on the mainframe is when you sit on it: you wrap text or, for JCL and other code, you continue on the next line
c) When you code stuff that is displayed on the screen you should use the code tags
I've never heard a JCL error of CC0990 - it may be somethingf new but in general JCL does not give completeion codes so it is probably the program that is using the parameter. Have you tried looking in the JCL manual for how to continue a parameter onto another line? Or searched the forum?