How to use alternate material in GI for MFBF per Batch Mfg dates

Hi Gurus

I need guidance of subject Issue

Scenario # For Repetitive manufacturing Confirmation via MFBF ,We are using alternate Batch Materials as priority 1 and 2

Ex# In case we have materials available stock  on Line  say Priority 1,Mat-X Bat-B1 Mfg date ( 31 Mar 2016) 

                                                                                                Priority 2 ,mat -Y -Bat-B2 Mfg date ( 31Jan 2016)

As per current set up we are able to achieve material usage per available stock for goods issue ,even use partial stocks to meet req

Requirement# Want system should also consider Batch Mfg dates for goods issue per FIFO principle ,In above case want system should pick up batch 2 ( P2 mat)  first for available Qty (old batch ) and then check for P1 material in case that's reqd.

Means # Consider Batch Mfg date also and use old batches first.

Thanks in advance

Upinder