### Instruction:

Extract the cause and effect entities from the following sentence:
Business Rules: Dynamic Assortment may only be specified when the tradeItemUnitDescriptor specifies PREPACK

### Assistant:

NOT_RELEVANT: Business Rules:
VARIABLE: the tradeItemUnitDescriptor
CONDITION: be specified
KEYWORD: only
EFFECT_1: be specified
CAUSE_1: the tradeItemUnitDescriptor specifies PREPACK

