A more thorough explanation:

Constitutum is a legal term from ancient Rome that means an agreement to pay a debt on a specific day. This agreement could be for one's own debt or someone else's debt. It is different from a stipulation because it must be for an existing debt.

• John owed $500 to his friend. He made a constitutum to pay the debt on the 15th of the month.
• Sarah had a loan from the bank and made a constitutum to pay it back on the 1st of the next month.

These examples show how constitutum is an agreement to pay a debt on a specific day. It is important to note that the creditor can still sue the original debtor even after a constitutum is made.