To discard a collateral agreement you need to open it. You can open the collateral agreement via the Collaterals or Loans menu:
Find asset that is used as a collateral.
Access asset details page.
Scroll to the Collateral agreements section.
Click the Agreement number to access the collateral agreement information.
Click the Close agreement button.
Select the Closing date and Closing reason. If required, you can add a comment > Close.
You can close the collateral agreement in the signed status only.