566 Product/Service Substitution Code
TYPE=ID MIN=1 MAX=2
Code indicating product or service substitution conditions
A No Quantity or Unit of Measure Change Allowed
X Equivalent Item Substitution
Y Alternate Item Substitution Allowed
B0 No Substitution Allowed
B1 Supply any Binding if Edition Ordered Not Available
B2 Supply Paper Binding if Edition Ordered Not Available
B3 Supply Cloth Binding if Edition Ordered Not Available
B4 Supply Library Binding if Edition Ordered Not Available
ZZ Mutually Defined