TYPO3 Exception 1481647089

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Nesting select and group elements in flex form sections is not allowed with MM relations

#1481647089: Invalid flex form data structure on field name "pi_flexform"
with element "foo" in section container "content": Nesting select and group
elements in flex form sections is not allowed with MM relations.

Happens on TYPO3 v8 when using a multiRelation field inside a section container

This also happens with flux 8 when using a <flux:field.relation> tag. This has been fixed in flux 9.0.0.