this problem is not depend on material type, if we have a perfect raw material lot No. tracking system we can solve this problem more easily
our company is the same situation before, but now weis setting up a shop floor system to track all material information, even as SMT resistor and capacitor are all included
U have face the obstacle in SQE,this is the most difficult in sqe working.
Generally,Most of SQE feel very headachy is the relation between company and supplier.As a middleman,this time is test you communicate skill and negotiate skill.
U must use your own attitude to take off from hot water.