Explain the purpose of each section of this legal form: 'Delete whichever is not applicable,' 'Reference No.,' and 'In the Maintenance matter between:'

Hey, good to see you again. This is a legal form, not a question to be solved with a numerical answer. I will explain what each section requires. "Delete whichever is not applicable.": This is an instruction. If there are options in the form (e.g., "declare under oath/truly affirm"), you should cross out the one that does not apply to your situation. "Reference No.": This space is for an official reference number, usually assigned by the court or office handling the application. You might leave this blank for the office to fill in, or if you have a previous case number, you can enter it here. "In the Maintenance matter between:" *(person in whose favour