Enforcement proceedings for attachment of a debt can be used to compel a third party who owes money to a judgement debtor to pay the money to the creditor instead of the debtor. This used to be called garnishee proceedings.
It's an effective way for a creditor to recover money if, for instance, the debtor is employed and refuses to pay. Enforcement proceedings for attachment of a debt are an alternative to an enforcement order for the seizure and sale of property.