Group by based on DAX column

[hanapbi]

I have 2 tables in the model. In the firsttable I bring a column from the second table using DAX function RELATED.

Talble 1:

Order ID	Product ID
1628	1
9200	2
8615	3
3874	4
1057	1
7250	2
1243	3
4668	4

Table 2:

Product ID	Price
1	100
2	50
3	150
4	230

And the first table after bringing another column:

Order ID	Product ID	Price
1628	1	100
1628	2	50
8615	3	150
3874	4	230
1057	1	100
7250	2	50
3874	3	150
4668	4	230

Now I need a new table that will show me Order ID and the total amount:

Order ID	Total Amount
1057	100
1628	150
3874	380
4668	230
7250	50
8615	150

I tried to do it in a few ways and non recognizes the new price column. 

I tried to add a table in the following way:

Total Price per order = SUMMARIZECOLUMNS(Orders[Order ID], "Total Order Price", Orders[Price])

I get the following error: 

A single value for column rpice in table Prders cannot be determined..

What am I doing wrong?

(couldn't find a way to attach the file..)

[Greg_Deckler · Accepted solution]

@hanapbi Try: Total Price per order = SUMMARIZECOLUMNS(Orders[Order ID], "Total Order Price", SUM(Orders[Price]))