CFAI says :
Maturity variance = diff btn the maturity of the given immunized portfolio - ideal immunized portfolio consisting of ZCB with maturity equal to time horizon
SCH says : its the difference between the maturities of the bonds used in immunization of strategy (same as CFAI) - maturity date of LIABILITY
you seem to be intent on dissecting apart Schweser. And I am amazed at how you detect these differences.
I would say go with the CFAI definition - as it looks to be the more complete definition.
This is the problem when anyone tries to supplement Schweser with CFAI. For level 3 one should only use CFAI text.
it’s effectively the same answer. i don’t see how this is an issue.