Read table ct_field_usage assinging <lfs_field_usage> with key name = 'Name of the field'.
if sy-subrc = 0.
<lfs_field_usage>-READ_ONLY = 'X'
ev_field_usage_changed = abap_true.
endif.
I tried this code for Input custom field. Its not working..Please some one suggest me how to grey out input field..
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