[Koha] Unable to import marc into koha

Sir/madam I am unable to import Marc data, in Koha 18.05.02.000. Earlier I did successfully But now, Problem is with field 952. Koha imports everything from Marc but not field no 952 and it's subfields. It is hectic for me to add accession numbers to 952$p and 952$o Call number to each entry. Kindly give me solution Rajesh Bhatt Librarian GRIMS VAPI