ABAP_to_the_Future

13
SAPUI5
email address or a telephone number, and some applications care about geocoordinates.
Because you have no idea what types of things may end up accessing this
data, you’re writing in letters of fire 1,000 miles high that something is a telephone
number—so that any application that does something with telephone
numbers is in no doubt about what field to look at.
Linking Header and Item via an Association
Next, you need to say that the items are related to the header, rather like defining
a foreign key relationship in a DDIC table. Right-click the Data Model node, and
choose Create 폷 Association.
The screen shown in Figure 13.8 appears. Here, choose what to link together
(header to items in this case), and fill in the Cardinality fields to say that one
header record needs at least one item record but can have many.
Figure 13.8 Creating an Association: 1 of 3
When you’re done, click the green checkm ark. The screen shown in Figure 13.9
appears. Here, link the key fields together (i.e., both Monster_Header and Monster_Item
have the same key field, MonsterNumber, and that’s how you can tell
which items relate to which header record).
Figure 13.9 Creating an Association: 2 of 3
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