Update values for additional (new) keyfield in database table

Question

Hi All,
Here in our firm we have a Z table with data in it. As part of the new requirement I had to add a new key field in it.
Now I have to maintain values for these key fields in the already existing data.
I cannot maintain it though SM30 as the maintenance view grays that field in SM30.
Is there any way of updating this new key field data in database.
Thanks,
Kajal

Answer 1

Hello Rob,
thank you for this information. Up to now, I thougth, that it is impossible to update the primary key. I've checked it in our system and it works. But it seems, that you have to use the "update set" to update a field of the primary key - am I correct?
@Kajal,
I've created a table:
Field      Key Data element
MANDT  X     MANDT
MATNR  X     MATNR
MAKTX         MAKTX
Then I've tried the following coding:
data: wa_test type zithtest.
select single * from zithtest into wa_test.
move: 'DE' to wa_test-spras.
update zithtest from wa_test.
write: sy-subrc.
select * from zithtest into wa_test.
  write: / wa_test.
endselect.
result: sy-subrc = 4 and no update of the primary key
Then I've tried the following:
data: wa_test type zithtest.
select single * from zithtest into wa_test.
move: 'DE' to wa_test-spras.
update zithtest set spras = wa_test-spras
                where matnr eq wa_test-matnr.
write: sy-subrc.
select * from zithtest into wa_test.
  write: / wa_test.
endselect.
Result: sy-subrc = 0 and the primary key has been updated.
By the way - reward points to Rob, as he has given the correct solution.
Best regards
Stephan
Edited by: Stephan Theis on Jan 17, 2008 9:50 PM