Import Statment doesn't importing data through Index table

Hi guys.

I am facing a problem during importing the data through index table, basically its two different program one program is export data which is working fine and export data to index table but when i trying to import this data from another program it doesn't importing,after upgrade to ecc6.

Here is my part of a source code of both importing and exporting program.

data: begin of tab4 occurs 100.
   include structure ypstructbaja.
data:end of tab4.

export tab4 from tab4 to database indx(st)  from wa_indx id indxkey.
free memory id  sy-uname.

///////////

importing program

data: begin of tab7 occurs 100.
   include structure ypstructbaja.
data:end of tab7.

import
              tab7 = tab7 from database  indx(st)  id indxkey
              to wa_indx.
tab4[] = tab7[].

I have checked the index table and data is exported to index table but not importing please help me waiting for your responce.

Thanks.