Cause : Block no of block search fwd lev 1 is no SP call comes when the block number for subprogram level 1, which was transferred with block search, does not contain a subprogram call for subprogram level 2.

• For the block search function, a block number with a subprogram call must be specified as the block number for subprogram level 1 if a block search is to be performed in subprogram level 2.