Resolve "Allow collection and circular attributes as endpoint targets"

Closes #53 (closed)

• Check, if collection and circular attributes can be specified as send endpoint targets.
• Add test cases to ensure correct handling.
• Update documentation, that they can be used.

changed milestone to %1.0.0

added Component: Backend Component: Documentation labels

assigned to @rschoene

added 1 commit

• 5a89cd75 - Working on bugfixes for attributes

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marked the checklist item Update documentation, that they can be used. as completed

added 1 commit

• e20920d5 - Working on bugfixes for attributes

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enabled an automatic merge when the pipeline for e20920d5 succeeds

merged

mentioned in commit e35acb46