Cause . . . . . : Level checking can be disabled only once in a single binder language source file. This warning occurred while compiling line &4 of binder language source &3 in file &1 in library &2 while attempting to create service program &5 in library &6. Recovery . . . : No recovery required. The LVLCHK(*NO) designation for the export block is ignored. Technical description . . . . . . . . : Disabling level checking generates a zero signature for the service program. No service program can export more than one zero signature.