Optional 1:1 aggregate relationship with inheritence

I have a class which has a 1:1 relationship via aggregation to another class. The 'aggregated' class also has inheritence.
Unfortunately this is actually a 1:0,1 relationship. The zero scenario has the class indicator field null for the aggregate object. I get the following error:
Exception Description: Missing class indicator field from database row [DatabaseRow(
Is there a way to map this relationship?
thanks,
craig

Hi,
Welcome to the forum!
I don't know what's causing that problem, but here's a woirk-around:
WITH got_rnk     AS
     SELECT     id
     ,     val
     ,     DENSE_RANK () OVER ( PARTITION BY id
                               ORDER BY         edate     DESC
                       ) AS rnk
     FROM     xmlagg_bug
SELECT       XMLELEMENT ( "root"
               , XMLAGG ( XMLELEMENT ( "sroot"
                                       , MAX (val)
               ).getClobVal ()     AS res
FROM       got_rnk
WHERE       rnk     = 1
GROUP BY id
;You shouldn't be using wm_concat any way. If you need a function like that, create your own STRAGG fucntion instead. You can copy STRAGG from
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2196162600402
STRAGG seems to do exactly the same thing as WM_CONCAT. I say it "seems" to, because WM_CONCAT is undocumented, so we don't know exactly what it does.

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We are using a characteristic relationship (with derivation) type Exit class. For that we have created class ZCL_RSPLS_ARTICLE_FROM_PLMOD as a copy of the standard class CL_RSPLS_CR_EXIT_BASE.
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Hi,
set a break-point in the factory method get_instance to check whether the class is called. In the planning modeler make sure that you use an external break-point.
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Characteristic relationships with derivation. I don't quite understand...

Hi, experts!
I'm trying to figure out all about using derivation in characteristic relationships and even though I seem to generally understand what it's for, some moments are still unclear.
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In the first aggregation level I'm using only the first 3 levels of item categories. The other 7 are not included.
Let's assume I've planned my key figures for those 3 levels, and saved the plan. I need the system to distribute (disaggregate) the values among the remaining 7 category levels, so when I open another plan, based on an aggregation level that includes all 10 item categories, I would see all the data correctly and all the necessary combinations.
As I understand, in that case I need to have characteristic relationships with derivation.
But SAP demands that all the "target" characteristics should be held in the "Data Fields" section of DSO. And therefore they won't be key fields.
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Hi Andrey,
derivation is a function, given the source fields the derive functions fills the target fields. In other words, given a relation with two characteristics A, B with A source and B target the derive function F modeled in the relation 'calculates' F(a) = b with a, b members of A,B, respecitvely. Since F is a function for a given a there are not two differen b1, b2 with F(a) = b1 and F(a) = b2.
Using a derivation relation modeled in a data store the function F is defined by the active table of the data store. So A has to be the key and B has to be a an attribute (non-key). If this is not the case and A, B are key fields you can have the combinations
A    B
a    b1
a    b2
and this is by defintion not a derivation relation, but an n:m relation.
On other words derivation fills redundant fields.
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before submitting them. If wrong submissions have been made, it enables automated corrections much easier as well. It is within reach for users with reasonable but not outstanding Excel / Xml knowledge but it requires some initial time investment.
Hope this saves time for others.
acontrario
Brussels

Optional 1:1 aggregate relationship with inheritence

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