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(if(! is_empty(xrn1_2_1_3.NAOK), xrn1_2_1_3.NAOK >= "1970" && xrn1_2_1_3.NAOK <= {(new Date).getFullYear()}, xrn1_2_1_3.NAOK == ""))
(if(! is_empty(xrn1_2_1_3.NAOK), xrn1_2_1_3.NAOK >= "1970" && xrn1_2_1_3.NAOK <= CurrentYear.NAOK, xrn1_2_1_3.NAOK == ""))