Power BI embedded in CRM Dynamics (Filter)

Hi!,

I have a field string in my CRM and use this field to filter my panel embedded in CRM. The problem is tha when the value of my filed is a number, does not work.

Example: 

My field has a value = *00001 that works fine becouse y have a character .

My filed has a value = 10001, this does not work becouse the value is a number. Curiosly if it has 000001 works fine...

<control id="filteredreport" classid="{ - - - - }">
<parameters>
<PowerBIGroupId>xxxxxxxxx</PowerBIGroupId>
<PowerBIReportId>xxxxxxxxxxxxxxx</PowerBIReportId>
<TileUrl>app.powerbi.com/.../TileUrl>
<PowerBIFilter>{"Filter":"[{\"$schema\":\"basic\",\"target\":{\"table\":\"Customer\",\"column\":\"CodCustomer\"},\"operator\":\"In\",\"values\":[$a],\"filterType\":1}]","Alias":{"$a": "new_myfilterstring" }}</PowerBIFilter>
</parameters>
</control>

Thanks for the help.
Best regards