# description
 Identifies what sort of change is permitted or has occurred between the item that was ordered/requested and the one that was/will be provided.

# property[].description
Indicates that the code is abstract - only intended to be used as a selector for other concepts

# concept[].definition
Some conditions may be attached to an allowable substitution.  An allowable substitution is based on a match to any other attributes that may be specified.

# concept[].concept[].definition
Confirmation with Contact Person prior to making any substitutions has or will occur.

# concept[].concept[].definition
Notification to the Contact Person, prior to substitution and through normal institutional procedures, has or will be made.