Cost estimation form quantity calculation not working correctly

[ArtOfSpring]

Hi there, I’m using a quantity calculation for an item (“Holzkreuzständer”).
The calculation works in the first step but if the result of the calculation is 0,
the item still shows up in the final order overview with the quantity of 1.

Here is the quantity calculation:
[item-283_quantity] = [item-282_quantity]-[item-285_quantity]
Holzkreuzständer = Baumanzahl-Wasserständer

What went wrong?
I attached a link to a test version of the form which can be modified

[friech]

Hi There,

Thank you for writing in, please review your calculation, turns out your second item quantity is dependent on the first item quantity, I can change the first item quantity and it will change the second item too. I can not change the second item quantity independently. So even if the second item turn off (0), but the first item has 1, then the second item will have 1 as well, (It seems like a bug), but it can also be a problem with your form configuration, would you mind making the second item quantity independent? Or if not, then maybe you can merge them in 1 item?

Estimation & Payment Forms
WP Cost Estimation & Payments Forms Builder - How to use custom calculations

Thanks,