Line chart between two dates

I might misunderstand your problem for which I have to apologize.

First of all, in order for USERELATIONSHIP to work you have to have a realtionship in your model, even though it is inactive. It's a 1-to-2 problem, you have one Date table but two date columns so you can have only one active while the other one is inactive. For example, if you create a measure filter for PurchaseDate line items and use the Date in a slider it will work just fine. But if you create a second measure for the PaymentDate and use the same slider you will fail. That's why, in the 2nd measure you have to put USERELATIONSHIP (but you must have an inactive relationship in the model - see screenshot).

Also, perhaps I am missing something becasue I don't understand why you keep refering to the MIN(dimCalendar[Date]) and why do you divide the Credit Outstanding Debts to the overall Installments rather than only Credit Installments.

I tried to replicate your scenario with your data and this is what I got. All data is filtered for Credit, and I adjusted the Installment measures.

Screenshot 1 - all outstanding debts for Credit purchases, all time. We have 5 of them, with a total amount of 4980, with a number of Credit Installments of 35 which gives us an average of 142 Accounts Payable.

Screenshot 2 - it gives us the Credit Outstanding Debts which have a Payment date after 1 June. We have only 2, amount 2300, 10 Installments so AP is 280

Screenshot 3 - how many Credit Outstanding Debts have been created from the beginning of the year until end of May AND how many had the PaymentDate in May. We have 2, amount 980, 15 Credit Installments so AP is 65.

Screenshot 4 shows the relationship model.

I hope it helps.