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New Member

Error exporting data

Using the Power BI Power Query designer, when attempting to export the data, an error is appearing.

"Your mashup exceeded the maximum length allowed by this service and cannot be saved. The 

last operation did not succceed, please refresh this mashup to continue.



Request ID: 

Session ID:

Mashup length: "2707.94KB"

Maximum length: "512.00KB"


Is there a way around this maximum length value? 

New Member

Hi, thank you for your reply and sorry for the confusion. I was posting this on someone's behalf and they have clarified what exactly they were doing. 

They were copying data from a large table in Excel and pasting this in to Power BI, to then manipulate the data in Power BI. The error appeared when attempting to paste the data in.

Hi @BSkeelsParadise 


Thank you for your feedback. Can you help confirm were they copying data from a table in Excel then pasting the data into Power BI Desktop through Enter Data? It might be because the table structure wasn't detected correctly in the Create Table window and multiple values were pasted into the same cell leading to exceeding the length limit.



You could click any cell in range of the table in Excel, use Ctrl + T to create a table. Then copy this table into Power Query Editor. In this way, it can be detected and pasted more correctly. 



However, since they were getting data from a large table in Excel, I would suggest using the Excel connector directly. This is designed to get data from Excel Workbooks and is easy to use. This will load data from Excel into Power BI report. The manipulations in Power BI will not influence the data in your Excel files. Connect to Excel in Power BI Desktop - Power BI | Microsoft Docs



Hope this helps.


Community Support Team _ Jing
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Community Support
Community Support

Hi @BSkeelsParadise 


Can you share how did you export the data from Power Query Editor? 


In addition, if you want to export data from Power BI Desktop, you could try R/Python methods or use DAX Studio.

Export data from Power Query to Local Machine or SQL Server using R scripts - RADACAD

Exporting Data From Power BI to SQL Server Using Python | Sandeep Pawar

DAX Tools - DAX Studio 15 – Export data - YouTube


Community Support Team _ Jing
If this post helps, please Accept it as the solution to help other members find it.

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