General question for 'IN'

Question

Hi all,
Although this is simple, but I really do not understand why it does not work.
I have 4 conditions that need to be checked, in str4, the option is NP, but why it still meet the if statement condition below?
It seems like it is performing as OR instead of AND.
Please advise how could my code will be, if I do not want it to meet the If statement.
types: begin of tr_str,
            sign   type c length 1,
            option type c length 2,
            low    type co_sttxt,
            high   type co_sttxt,
           end of tr_str.
data: lr_str type range of tr_str,
      wr_str like line of lr_str,
      gv_str type co_sttxt.
wr_str-low    = 'str1*'.
wr_str-sign   = 'I'.
wr_str-option = 'NP'.
append wr_str to lr_str.
wr_str-low    = 'str2*'.
wr_str-sign   = 'I'.
wr_str-option = 'CP'.
append wr_str to lr_str.
wr_str-low    = 'str3*'.
wr_str-sign   = 'I'.
wr_str-option = 'NP'.
append wr_str to lr_str.
wr_str-low    = 'str4*'.
wr_str-sign   = 'I'.
wr_str-option = 'NP'.
append wr_str to lr_str.
gv_str = 'str4 str5 str6 str7'.
if gv_str in lr_str.
  write: / 'do something'.
endif.

Answer 1

The logic works because the IN does work as a series of OR statements. If any of the entries are true then the IN is true.
'str4 str5 str6 str7' satisifes both the 'NP str2' and the 'NP str3'. If you comment out these two entries you will not get the 'do something' message appearing.
Also note that your declaration of the range is a bit odd.
types: begin of tr_str,
            sign   type c length 1,
            option type c length 2,
            low    type co_sttxt,
            high   type co_sttxt,
           end of tr_str.
data: lr_str type range of tr_str,
      wr_str like line of lr_str,
      gv_str type co_sttxt.
This actually gives you a range of ranges. Is that what you really want?
I tdon't think you need your own type and can simply decare it like this:
data: lr_str type range of co_sttxt,
      wr_str like line of lr_str,
      gv_str type co_sttxt.