Track change in table

Hi,

I am not sure how your data model looks like or how your desired outcome visualization looks like, but please check the below picture and the attached pbix file.

I tried to create a sample pbix file like below, and I hope the below can give an idea on how to create and apply the measures to your data model.

Selling price status: = 
VAR currentyear =
    MAX ( 'Year'[Contract year] )
VAR sellingpricetable =
    SUMMARIZE ( RELATEDTABLE ( Data ), Data[Selling price], Data[Date start] )
VAR countsellingprice =
    COUNTROWS ( sellingpricetable )
RETURN
    IF (
        HASONEVALUE ( Contract_ID[Contract ID] ),
        IF (
            countsellingprice = 1,
            "NoChange / " & MAXX ( sellingpricetable, Data[Selling price] ),
            CONCATENATEX (
                sellingpricetable,
                Data[Selling price] & " " & Data[Date start],
                "->"
            )
        )
    )

Payment term status: = 
VAR currentyear =
    MAX ( 'Year'[Contract year] )
VAR sellingpricetable =
    SUMMARIZE ( RELATEDTABLE ( Data ), Data[Payment term], Data[Date start] )
VAR countsellingprice =
    COUNTROWS ( sellingpricetable )
RETURN
    IF (
        HASONEVALUE ( Contract_ID[Contract ID] ),
        IF (
            countsellingprice = 1,
            "NoChange / " & MAXX ( sellingpricetable, Data[Payment term] ),
            CONCATENATEX (
                sellingpricetable,
                Data[Payment term] & " " & Data[Date start],
                "->"
            )
        )
    )