RELEX completion codes

When the system returns control to the problem program, the low-order byte of register 15 contains one of the following return codes. The 3 high-order bytes of register 15 are set to 0.

The RELEX return codes are:

Return Code (15)	Meaning
00 (X'00')	Operation completed successfully.
04 (X'04')	The specified data block was not in the exclusive control list.
08 (X'08')	The relative track address, relative block address, or actual device address was not in the data set.