We know that [Should have + past participle] can mean something that would have been a good idea, but that you didn't do it. As in the following example-
Example: I should have studied harder but I didn't.
.....They will be eligible to claim the allowance for three months during the period from start of lockdown on March 24 to December 31. They should have been part of the scheme for two years during the period from April 1, 2018, to March 31, 2020, and should have contributed at least for 78 days from October 1, 2019, to March 31, 2020 and also in one of the other three six monthly contribution periods from April 1, 2018. TNN
But in this paper cutting "should have" seems to have been used in different sense. Please clarify it.