The FORMLEN keyword specifies the form length of a PRINTER file. The form length must be greater than or equal to 1 and less than or equal to 255. The parameter specifies the exact number of lines available on the form or page to be used.
Changing the form length does not require recompiling the program. You can override the number parameter of FORMLEN by specifying a new value for the PAGSIZE parameter of the Override With Printer File (OVRPRTF) command.
When the FORMLEN keyword is specified, the FORMOFL keyword must also be specified.