Cannot get dynamic attribute through rest api

When my project was upgraded from 6.9 to 7.1, I can not use rest api to get the dynamic attribute with the following request:
localhost:8080/app/rest/v2/entities/sys$CategoryAttribute
and an error comes out like these:
ERROR c.h.a.r.a.c.RestControllerExceptionHandler- Exception in REST controller
com.haulmont.cuba.core.app.serialization.EntitySerializationException: Primary key property not found for entity sys$CategoryAttributeConfiguration

Hello @zhangdaiyuan,

Thank you for reporting the problem. I created a ticket.

Regards,
Nikita

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