popup text line chart issue

[#1]

I have an issue with a line chart.

- 2 dimensions : month and category.

-  expression 1: sum(measure)

-  expression 2 as popup text - (so line checkbox is off and text as pop-up is on).

desired result = see picture

percentage comes from expression 1, aantallen comes fromt expression 2

This result will only show when the popup expression is the first expression in the expression box, otherwise aantallen is not shown.

but...

i want to adjust the colors of the lines in the chart. when i do this with the expression 1 on the second place in the expression box, the object will give an error: Drawing of chart failed internally. when i put in the first position, it will color the lines, but wont show the 'aantallen' in the popup.

remarkeble: when i put the same settings in a bar chart it works fine.

Anybody now a solution, or if this is a known bug?