EEWB : how to determine the business object and the extension type ?

Question

Hi,
I ask myself how to determine the business object and the extension type to use to add new fields in a new tab of a specific transaction ? what means each business object, does that correspond to a specific transaction ?
I need to add a new tab in the ‘BaMI’ business activity in transaction CRMD_ORDER just after the tab 'Actions' at header level.
Could you help me please to determine which business object and extension type I have to select during creation of the project and which business object category I have to select during creation of the extension (wizard) ?
Thanks for your help,
Marie

Answer 1

Marie,
In order to determine what type of transaction you are extending, you will need to look at the customizing for the transaction.
In the IMG:
Goto:
Customer Relationship Management->Transactions->Basic Settings->Define Transaction Types.
You will then choose the transaction defined that you want to extend.  If you display the details of the transaction you will find an attribute called:
"Leading Transaction Category".  This tells you the general context in which the transaction is used.  The other item to view is the assignment of business transaction categories found in the maintenance screen.
This information general corresponds to one of the options that the EEWB will give you on the transaction type.
As far as extensions go, my recommendation is the following:
- Use CUSTOMER_H Customer Header Extensions for any new fields at the header level.
- Use CUSTOMER_I Customer Item Extensions for any new fields at the item level.
Unless you have a specific requirement to extend a segment of the transaction, I recommend placing all new fields in these segments.  The CUSTOMER_H & CUSTOMER_I segments are considered "standard" segments, that are already built into all the necessary API structures. 
Let me know if you have any further questions.
Good luck,
Stephen