Measure Total not correct - again!

I set up a new file and splitted the tables even further. Now its working perfectly - without any "IF HASONEFILTER".

Probably i had two problems in my Example file. First of all my data model hat an incorrect relation. My first step of aggregation is from my quantities/costs to the LV table. After that, cost per Position are splitted among different activities and then equally divided by the working days in my schedule. Second problem was a misunderstanding of the DAX Syntax for the filter.

In the end, i wanted to select a specific date and cost-group and get cross filtered tables as a result, whereby all costs shown are a sum of the costs per day. So if "Position 400" needs 5 days to finish and costs (overall) 100k, each day gets 20k. If i select 01.01-03.01 my result is 60k - in each table.

Heres my reworked solution

https://1drv.ms/u/s!AnnYPqfuqv4ChLdGg6gksXtMxQTpMA?e=QWYYDS

Thx for the help anyway! This Forum gave me the idea how to solve that issues.