Can't Display the Visual Error, Multiple Filters and Relationships

Hi

I am attempting to make it possible to filter/splice my calculation but I am recieving an error due to "ambigous path".

For information, I have the following tables: "Employee Register", "Incidents" and "Hours Worked" as well as a "Date" Table.

Employee Register Table

Incidents Table

Hours Worked Table

Active Relationships

• Employee Register (Start Date) and Date (Date), Many to one, Single
• Hours Worked (Employee Number) and Employee Register (Employee Number), Many to one, Single
• Incidents (Date of Incident) and Date (Date), Many to one, Single

Inactive Relationships

• Employee Register (End Date) and Date Table (Date), Many to one, Single
• Hours Worked (Posted Date) and Date (Date)
• Incidents (Department) and Employee Register (Department), Many to Many, Both
• Incidents (Business Unit) and Employee Register (Buisness Unit), Many to Many, Both
• Incidents (Location) and Employee Register (Location), Many to Many, Both
• Incidents (Employee Type) and Employee Register (Employee Type), Many to Many, Both

I've currently got the following measurement to calculate the rolling 12 month LTI numbers: