Adding calculated row numbers to simple dataset

[rax99]

consider this basic table;

Customer	Date	CallID	DesiredRowNumber
A	20180109	45004	1
A	20180110	54596	2
A	20180111	45445	3
A	20180112	42231	4
A	20180112	52454	5
A	20180114	54600	6
A	20180127	15719	7
B	20180904	54602	1
B	20180904	86441	2
B	20180904	54604	3
B	20180915	68487	4
B	20180927	54606	5
B	20180929	26544	6
C	20180909	54608	1
C	20180909	46584	2
C	20180909	54610	3
C	20180930	67866	4

I need the row numbers as per DesiredRowNumber as a calculated column. iv not included any other fields from the actual table because im only interested in ordering rows by the Date and by customer. It should be in the order of the date.

[PattemManohar · Accepted solution]

@rax99 Please add an "Index" field in Power Query and then add the below logic as new column in Data pane.

Rno = RANKX(FILTER(Test145RowNo,Test145RowNo[Customer]=EARLIER(Test145RowNo[Customer])),Test145RowNo[Index],,ASC,Dense)