How do I get to know the structures stored in a cluster table

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Dear fellow developers,

this question is about Cluster Tables of the INDX-type which need to be read with

IMPORT/EXPORT FROM/TO ...

I need some advice concerning the question of how to find

out the definition of a structured field in such a cluster.

To be more precise:

By using the command

IMPORT DIRECTORY ...

I know that in the table/cluster

VARI

section

VB

there are two structured

fields the content of which I'm interested in for reading and writing purposes:

%_VARI40C

and

%_VARIVDAT

I already know the structure of the first one, but only because I found a Standard FM that reads it with an appropriately defined WA-structure, but I cannot find something similar to find out the structure definition for the other one (%_VARIVDAT). It can't be possible that this is so difficult to find out. There must be some better and easier way to find this out that I don't know yet...

Thanks in advance for your appreciated help

Andreas