FRE= parameter for procedures
Use the FRE= parameter in procedure to specify a 1- to 5-digit number of fetch request elements used to load MFS blocks into the message format buffer pool.
The number specified can range from 1 to 99,999, with a default value of 30. If the size of the buffer pool is increased using FORMAT= in the DFSPBxxx member of the IMS PROCLIB data set or JCL, the number of FREs should also be increased. Otherwise, the additional space cannot be used.