Deformable Objects and MFN components ?

Hello,
I created a new assembly in SolidWorks, using two deformable objects (ie spring compressed in two differents positions)

-ASM
    -Spring 15mm    EIN=0001
    -spring 20mm    EIN=0001
    
spring free : spring.sldprt (deformable)
spring 13 mm : spring_13.sldprt (deformed)
spring 20 mm : spring_20.sldprt (deformed)

then I want to create the MBOM for this assembly, using MFN.
I want to create:
-Manufacturing Assembly
    -Provided Part 0001 ==>scope==> Spring 13 mm
    -Provided Part 0001 ==>scope==> spring 20 mm ==> error message when I tri to creeate the scope link : Scope link already exists for 'RESSORT DBR'
    
So, how can I do to create one Provided Part, linked with the two Physical products "Spring 13" and "spring 20" ?

thanks