A. Change all occurrences of :SYSTEM.cursor_block to :SYSTEM.trigger_block,
B. Use system variables in the GO_BLOCK statements.
C. Change the block names to uppercase in the GCLBLOCK statements.
D. Change the block names to uppercase in the condition (IF …THEN) statements.
E. instead of naming the block to navigate to, replace the GO_BLOCK built-in with NEXT_BLOCK
F. Move the code to a PL/SQL program unit.