Troubleshooting Meta Data Query¶
This page describes how to troubleshoot the issues encountered when you query meta data.
Failed to Query Attributes or Measurement Points under an Object Type Using the Meta Data API¶
When you try to query data through the meta attribute/measurement point API, some attribute/measurement point data under the target object type cannot be queried.
Cause¶
By default, Common Data Service only supports querying the attributes and measurement points defined on the EnOS model directly associated with the object type, and cannot query the attributes and measurement points defined on the sub-models.
Solution¶
Get attributes/measurement points defined on sub-models by configuring virtual attributes/measurement points. For example, to get measurement point abc
on a sub-model, you can define a virtual measurement point “abc” whose expression directly refers to measurement point abc
on the sub-model. For more information, see Measurement Point Expression.