How to disable the implicit rule "fuehrendesBlank"

Modeling
1

We have a document model that contains a transient field where the data is actually retrieved from a 3rd party source and we have no control over the data that we get from there (but we trust the source).

When saving a document based on the model, it fails with the following error:

com.mgmtp.a12.dataservices.document.exception.DocumentValidationException: Document is not valid:
[Entity: /Root[1]/FormHelpers[1]/SomeStringField[1] Type: VALUE_ERROR Message: Es sind nur Werte erlaubt, die nicht mit einem Leerzeichen beginnen. ErrorCode: fuehrendesBlank Rule: formalePruefung]

The field itself is marked as transient and is defined of type “String” without any further restrictions.

We already enabled the “Line Breaks Permitted” option, but I can’t find an option to permit leading spaces.

How can we avoid this error?

2

This Formal Validation can not be deactivated. Leading and Trailing Spaces will lead to the respective Error.

There is A12-Ticket A12-15233 to allow leading and trailing spaces or handle their trimming automatically.

Feel free to add your use-case and priority there.

Currently, you have to strip the whitespace by custom code before validating/persisting the document.

3

Thanks for the (disappointing) answer.

Are there any other implicit and hidden kernel validations, that we need to be aware of?