Your ADIF file needs to includes the following fields where appropriate
<MY_SOTA_REF:x> SOTAid for each QSO and
<SOTA_REF:x> SOTAid for each QSO where there is also a SOTA chaser.
x is the number of characters in the SOTA id. e.g <MY_SOTA_REF:10>VK3/VT-001
Two sample QSOs can be seen at ADIF Import for Activation?
I hope this helps.