SLIN : Extended Syntax Check [TCODE]

SLIN is the ABAP Program Extended Syntax Check tool. It is basically used to perform a code reviewof the program. Its best practice to check the program in SLIN before transporting the program.

SLIN : ABAP Program Extended Syntax Check
SLIN : ABAP Program Extended Syntax Check

Just specify the program name and select the checks required and exceute to see all the problematic areas.
SLIN overview
Click on each area to see exactly where the problem is

SLIN : Check Where the problem lies