The difference between

1. Conditional base value
2. Conditional value.
3. Conditional amount

1. Conditional base value

When a value is derived for a condition type, based on certain calculation this value is taken as base.

2. Conditional value.

For the number of units ordered depending on the condition amount mentioned this value is derived.

3. Conditional amount

This is nothing but the unit list price what you are mentioning for the line item.