KB223954: The series in Dual Y Options category for Line graphs are not retained when selecting different answers in a prompt filter in MicroStrategy 9.4.x

SYMPTOM:
  In Strategy 9.4.x, the series in Dual Y Options category for Line graphs are not retained when selecting different answers in a prompt filter.
 
STEPS TO REPRODUCE:
Follow the steps below to reproduce the issue with Strategy Tutorial project:

• Create a report with the following objects.
  Row: Month attribute    
  Column: Subcategory attribute and Cost metric
  Local Filter: an attribute element prompt filter based on Subcategory attribute
  Subtotal: Total
   
• Switch to Vertical absolute line.
   
• Enable 'Show subtotals in the graph' option in Graph option.
  

• Enable Dual Axis, select TotalCost to Secondary Axis, and leave other series on the Primary Axis in Dual Y Options, as shown in the image below:
  

• Save and close the report.
   
• Run the report and choose a different number of prompt answers. Note that the series in Primary/Secondary Axis are not retained, as shown in the image below:
  

   
CAUSE:
This is a known issue with Strategy 9.4.x.
 
ACTION:
Currently this issue is being reviewed by Strategy for a potential code fix on an upcoming Strategy release.
The Strategy Internal Reference Number for the issue discussed in this technical note is 991892.