The sequence set block at the specified RBA (relative byte address) contains an error. The following tests are made for a valid block:

• The block must be in collating sequence with the previous block on the sequence set.
• The first index block identifier (offset 00) must be X'8A'.
• The second index block identifier (offset 03) must be X'4E'.
• The displacement to free space must be greater than the displacement to the last entry.
• The displacement to free space must be less than 4096.
• The last byte before free space (the end of block delimiter) must be X'0C'.
• The entry identifier of the last entry in the block must be X'20'.
• The entry identifier for all other entries must be X'21' or X'22'.
• All entries must have correct lengths and pointer section identifiers of X'62' or X'66'.
• The block must be a level 01 block.
• The RBA (relative byte address) for the next byte in the sequence set must be nonzero, with the two high-order bytes zero, represent an address on a 4K boundary within the extent of the RACF® database, and be not more than 4 bytes long.