check that search term is all digits before trying to match SN exactly
check that search term is all digits before trying to match SN exactly

Signbank/BSL-signbank,Signbank/BSL-signbank,Signbank/BSL-signbank,Signbank/Auslan-signbank,Signbank/Auslan-signbank,Signbank/BSL-signbank,Signbank/Auslan-signbank,Signbank/Auslan-signbank