How the system will behave while picking the lots with expiry dates if there is no picking rule?

How the system will behave while picking the lots with diffrent expiry dates if there is no picking rule created.

We have a business case :

• We have lots with expire dates
• there is no picking rule created
• The user is expecting that the system is to pick on a default logic how ever there is no pick rule exits.

The question here, is there is a default logic or behavior for picking when no picking rule creates?

if yes? what is system behavior here?

Thanks