How to manage HDBDD changes

Question

Hi Friends.
First Time Table Creation – with 1 Key
namespace sem_ops.SEM_OPS_CDS;
@Schema : 'SEM_EDM'
context ZTBD_TEST_HDBDD {
type SString : String(40);
@Catalog.tableType: #COLUMN
Entity Details {
Key PERS_NO : String(10);
  FIRSTNAME : SString;
Second Time Table Creation – Trying to delete the table
namespace sem_ops.SEM_OPS_CDS;
@Schema : 'SEM_EDM'
context ZTBD_TEST_HDBDD {
type SString : String(40);
@Catalog.tableType: #COLUMN
Entity Details {
Key PERS_NO : String(10);
Key FIRSTNAME : SString;
As per SAP we need to drop and recreate so my to delete I then edit the hdbdd file as follows
namespace apple.gbi.sem_ops.SEM_OPS_CDS;
@Schema : 'SEM_EDM'
context ZTBD_TEST_HDBDD {
type SString : String(40);
Third Time Table Creation – Trying to recreate with more keys
namespace apple.gbi.sem_ops.SEM_OPS_CDS;
@Schema : 'SEM_EDM'
context ZTBD_TEST_HDBDD {
type SString : String(40);
@Catalog.tableType: #COLUMN
Entity Details {
Key PERS_NO : String(10);
Key FIRSTNAME : SString;
The above scenario works good if you are in development stage and this is happening in Dev.
Now lets assume after Step 1 things have moved to production .
For my step 2 and step 3  - I am editing the same hdbdd file. Do I  need do step 2 and bundle it in a delivery unit and release it and then do step 3 and then bundle and move it. Is the concept similar to transport where deletion and creation should be different transports.
Regards
Poonam

Answer 1

Albert-Jan,
I think you should look to introduce the concept of Discontinued parts  that is being replaced with followup material.
If it is a 1 to 1 replacement it can be easily done by using MRP4 view fields Dis continue ind =1, effective out date= date in future & folloup material.
So in your case in material master of A, use dis con ind =1, effective date in future, folloup material =B.
system will then start planning for material B automatically when the effective future date is reached ( taking into account that stock of A is 0)
If you  need more complex replacements then it can be done in BOM. You can refer SAP help on this topic as well by following bewlo URL
http://help.sap.com/saphelp_470/helpdata/en/ea/e9b4124c7211d189520000e829fbbd/frameset.htm
Hope this helps. If you need more clarifications please come back.
thanks,
Ram