ABAP_to_the_Future

9
BRFplus
Figure 9.34 Overlap Check Showing that Rows are in the Wrong Order
In such a circumstance, you can go ba ck to your busines s expert and query
whether the rules are correct after all. The equivalent check would be a lot harder
to do in conventional ABAP without a great deal of unit tests, and even then you
would probably miss these errors.
The completeness check is intended to tell if you if it’s possible to evaluate every
single row and still not find a result . The preceding exam ple would cause the
check to scream, because the user could put in the region SOUTH, and no result
would be found. This would be tedious to achieve in a normal ABAP method or
function module—looping through every possible combination of input values
looking for a failure to return a result. (As a caveat, the completeness check won’t
work when the text values are not linked to data elements with domains, because
the system has no way of knowing what possible values a user can input.)
9.4 Simulations
This chapter has talked about conventionaltechniques for storing rules, which can
be a bit of a black box; in other words, it is difficult to tell how exactly a given decision
was reached. This can be taken further: When you make a change to an ABAP
program or a customizing table, you might be able to do a test and see that the
result has changed, but can you really be sure why? To get around this, the BRFplus
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