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Get current line of TableControl within BAdI

Hi,

I have implemented BAdI BADI_MAT_F_SPEC_SEL to disable field input of field 'MG03STEUER-TAXKM' on screen Sales Org. Data 1, table Tax Data. The field should be enabled or disabled based on the field value. I can retrieve the tables values via function module MLAN_GET_BILD but I also need the current line of the table to determine correct field value.


I tried to determine the index with the system fields SY-STEPL and SY-LOOPC but it does not work. I always get the same indices regardless of table scroll position:


lv_index = sy-loopc + sy-stepl - 1.


The TableControl I want to read is TC_STEUERN and it is contained in program name SAPLMGD1, screen number 2184. The scructure of the TabelControl has the current line index, but I can only access it via dynamic field assignment:


if fauswtab-fname = 'MG03STEUER-TAXKM'.

    check sy-loopc > 0.

*   get index of current table row

    assign ('(SAPLMGD1)TC_STEUERN-CURRENT_LINE') to <fv_index>.

    check sy-subrc = 0.

*   ...

*   ...

endif.


Is there an official 'clean' way to determine the current line index of a TableControl within a BAdI or an Exit?

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