shelf life in snp settings

Hi

could you please let us know how we would configure the shelf life scenario in APO SNP we will try to updated batch and class from in snp through

R3. We have get the date from ECC batch and class.But when we view the SL date of batch in RRP3 T-code in element tap it is not populated.it has show 01.01.1970 along with batch.

Please let me know how it populate the 01.01.1970.