Although as per form GSTR 2B, there is specific column (iv) to report import from SEZ unit. Sec 16(2)(aa) inserted w.e.f 01.01.2022.On reading subclause (a),there is requirement that ITC claimant should be in possession of either tax invoice or debit note or other tax paying document(as BOE in your case) but when you go through subclause (aa)it says
THE DETAIL OF INVOICE OR DEBIT NOTE REFERRED TO IN CLAUSE (a) HAS BEEN FURNISHED BY THE SYPPLIER IN THE STATEMENT OF OUTWARD SUPPLIES AND SUCH DETAILS HAVE BEEN COMMUNICATEDTO THE RECEIPIENT OF SUCH INVOICES AND DEBIT NOTE IN THE MANNER SPECIFIED UNDER SECTION 37.
this clause does not require
(1) communication of other tax paying document(as BOE in your case)
(2) in the manner specified under section 37 i.e., furnishing details of outward supplies by registered person, being your supplier is a sez unit, sez unit is not required to furnish detail of DTA supplies under the cover of BOE in form GSTR-1, as per instruction 9 to the Form GSTR-1
above arguments can work in your favour.
Practically also SEZ BOE are available in GSTR-2B after a time gap of 8 to 10 months or in the month of march only
Regards
Ajay Chharia