Run-Time-Error when save customize table strip data in freight order

Hi BOPF Expert,

   I add a customize table strip in freight order side, and it's base on a customize node in BOBX creation.

   in this table strip customize area, after i entry input fields and click SAVE button, a run-time-error occurs.

   check ST22 see:

    check abap program side:     

      please advice, many thank.