How to create Fixed Length Flat File from Open Hub in BI 7.0

Question

My requirement is to produce a Fixed length Flat file by Open Hub destination. My Open Hub has four fields. Now the requirement is to create another extra field in Open Hub which will contain all of the four fields value. In addition to that the fields should be fixed length that means if for any field no value is there and the field length/type is CHAR4 then 4 spaces should be there as the field value. SO, basically the Open Hub output will be single field which will contain information of four fields.
How to get this using End Routine of Transformation (from DSO to Open Hub) ?

Answer 1

Hi,
You can map the four input fields to the new field in the Open Hub, and change rule type to "Routine".
For example, if your source fields are called "first", "second", "third" and "forth", the ABAP routine could be similar to:
DATA: l_t_1  TYPE C LENGTH 4,
      l_t_2  TYPE C LENGTH 4,
      l_t_3  TYPE C LENGTH 4,
      l_t_4  TYPE C LENGTH 4.
IF source_fields-first IS INITIAL.
  l_t_1 = '    '.
else.
  MOVE source_fields-first TO l_t_1.
endif.
IF source_fields-second IS INITIAL.
  l_t_2 = '    '.
else.
  MOVE source_fields-second TO l_t_2.
endif.
IF source_fields-third IS INITIAL.
  l_t_3 = '    '.
else.
  MOVE source_fields-third TO l_t_3.
endif.
IF source_fields-forth IS INITIAL.
  l_t_4 = '    '.
else.
  MOVE source_fields-forth TO l_t_4.
endif.
CONCATENATE l_t_1 l_t_2 l_t_3 l_t_4 into result.
In the example, the program uses four blank spaces if any of the fields has no value. 
Additionally, if non-initial values in input fields could be shorter than 4 characters (if the input fields have no fixed length), you could use STRLEN to evaluate if it is necessary to add blank spaces to complete the fixed length of 4.
I hope this helps you.
Regards,
Maximiliano