feat: erp entity interface extended

The ErpEntityInterface has been extended by general methods such as getUUID and getPrefixedNumber. This separates the internal database ID from the other assignment ids/numbers

BREAKING CHANGE: ErpEntityInterface extended

enabled an automatic merge when the pipeline for 586e539e succeeds

merged

mentioned in commit 4e561ff3

This MR is included in version 2.0.0

The release is available on GitLab release.

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