Hi @NalumachuA: If i understand this correctly,

• you have a single value property in Data class
• You have a page property in work class where the page definition is given as the data class
• You have a section in  work class and you are trying to use the single value property from data class in the section
• All the above 3 are in same ruleset and version (this is not mandatory, it depends on your app stack)

If this is the case, please check if you are referring the property using page context (.pagepropertyname.singlevaluepropertyname)

Note: it is better to create the section in the data class and include the entire section using the page.

Please let me know if this helps.

Thanks