Getting the Most recent Comment in PowerBI!

Dear Experts, Can someone help me? Its quite urgent

I have a PowerBI Report, Containing 3 data sources. 

One datasource is SQL, and other 2 are sharepoint lists.

There are around 20 columns in SQL Datasource, while I have used other 2 sharepoint, where the customer and supplier comments are stored.

I have embed 2 powerapps in PowerBI report which takes the comments based on the click of an entry in the report and fetch 4-5 columns and just asks for a comment which is saved in the sharepoint, Plus its shown in the report as well.

The problem is, now i can see all the comments of Customers and Suppliers in the report.

I would like to a measure to show only the recent comment for both customer and supplier column.

I tried to use this dax statement but it gives an error at the end, I am not sure what i am doing wrong.

LatestComment =
VAR _maxDate = CALCULATE(MAX(SharepointListofComments[Date Column Stored in Sharepoint List]), FILTER(ALL(SharepointListofComments),CSharepointListofComments[comment colum] = MAX(SharepointListofComments[commentcolumn])))

RETURN
IF(MAX(SharepointListofComments[datecolumn]= _maxDate,1,0))

Can someone help me with the issue its been a longtime, i am trying to find a solution but still no luck.

I would be grateful for your help