New alternative of using CONVERSION_EXIT_ALPHA_OUTPUT or INPUT
An alternative way of using CONVERSION_EXIT function modules is now available. Below post shows how to use them.
DATA: lv_matnr type mara–matnr VALUE ‘000000000340000001’.
DATA: lv_mat_out type mara–matnr,
lv_mat_in type mara–matnr.
lv_mat_out = |{ lv_matnr alpha = out }| .
lv_mat_in = |{ lv_mat_out alpha = in }| .
SAPCODES 
As matnr has an own conversion routine I think using it here for showing alternatives for conversion_exit_alpha is not a good idea.
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