No it is not possible.
It seems that you do not know what functionality Easy Condition Entry ECE provides.
Let me explain it in a more explicit way. And you may mark this as correct answer ^_^.
Let me make up this story as an example. When you create a sales order on webui with a product in item 10, pricing is carried out. The main pricing condition type is PR00 for example and it is always determined as 120 USD. Somehow, you can not modify any pricing determination or condition record. The end user needs to change it manually. But it is so inconvenient that end user has to go to item level and change PR00 from 120USD to 100USD EVERYTIME!
Now SAP CRM provides this ECE function that you may easily modify up-to-5 condition types' amount, currency and unit in Item assignment block on header level without going into any item details. This is a quick entry to a condition type for this item.
This is why the condition you fill in SPRO -> Set up easy condition entry must allow manual entry.
You can only set up max 5 condition types for a pricing procedure.
On webui, you will see fields like below for each condition type.
Condition *** 1
Condition *** 2
***
Condition *** 5
And for each condition type, we provide fields below,
Condition amount 1 -> changeable , price per unit
condition currency 1 -> changeable , currency of this cond
condition price unit 1 -> changeable, price unit of this cond
condition type 1 -> display only, desc of this cond
condition unit 1 -> changeable, unit measure, like piece or kilogramme
condition value1 -> display only, = amout1 / price unit1
Spencer