Problem with order of rows from query editor to apply changes

Hi,
I am new in Power Bi,  In my query editor I have  independent columns for date(dd/mm/yyyy) and time(HH:mm:ss) and other data. In the query editor my data is ordered chronologically. (example of my columns data headers:
Date                Time         ItemID                         DataValue1
17/03/2019      00:00:11  4B2E71BED93272CB    93.9477

When I close and apply changes the orders of the rows changes (I got mixed order in date and time rows). I need the data in cronollogical order so when I am ploting using scater chart the data is displayed in cronological order.

1.How can I do so when I close&apply changes in the query the order I have in the rows doesnt change?

2. I have tried to apply ordering filter options for the colums date and time in the power Bi desktop (after applying changes in the query editor) but since I have different colums for date and time I can not do that. Any recomendation??

3. My intention is to use scatter chart:
x-Axis: ItemNumber ( in cronological order with respect day and time-same order I have in my query editor data)
y-Axis: The corresponding DataValue1

thanks and looking forward to getting some help