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Helper III
Helper III

Unable to expand a column (prefix with underscore) in Accounts entity from Dynamic 365 online


Happy New Year to you all!!

My power bi is connecting to Dynamic 365 online. I need to expand a column in Accounts entity which I believe it has the id which connects to Connection entity.

At the moment, there is no relationship between tables. I will form a relationship I can manage to expand the columns I need.

I am trying to expand the following columns in account entity:


No matter how many times I try, they stuck... I have been waiting at least 24 hours before clicking cancel since information was no longer downloading. The entity is not huge, it is about 1 GB. 

I also tried to expand the information individually e.g. Expanding account_connections1._record1id_value and then account_connections1._record2id_value. It worked once and I ended up stucking again...

Also, I am unsure what the 'underscore' really mean but I guess it is a representation of a primary/foreign key to a table.

Are there any other ways to solve this problem? It is because I cannot expand the information I need.


Helper III
Helper III

Hello @v-lili6-msft, I removed all my tables apart from one account table. The pbix file is 1642KB. I also fiiltered my data based on createdon date. So it has 1.5 year of data only. I successfully expanded : account_connections1._record1id_value account_connections1._record2id_value But it stuck again when I expanded: account_connections2._record1id_value account_connections2._record2id_value Are there anymore example for table.buffer if this is the only solution I could go for? Thanks, Ricky
Community Support
Community Support

hi, @rickylee

It seems that the dataset is too large to run slowly. Your dataset is about 1GB, and from your screenshot,

you had duplicated it again, then merge and expand.

If you could try to filter the dataset and try it again. for power bi pro/ free licenses. there is a dataset size  Limitation

  • Dataset size limit - there is a 1 GB limit for each dataset in the Power BI service.

and you also could have a try by Table.Buffer

Please understand that this link is provided “AS IS” with no warranties or guarantees of content changes, and confers no rights.



Best Regards,



Community Support Team _ Lin
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

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