A mortgage which secures advances, up to a maximum amount of indebtedness outstanding at any time stated in the mortgage, plus accrued and unpaid interest. Have an existing future advance provision?The mortgage modification agreement is a legal document between a lender and borrower to change an existing loan's terms. Businesses can also record documents, and have the option to record documents electronically. DECEDENTS, ESTATES AND FIDUCIARIES. Chapter. 1. This Mortgage is an Open-End Mortgage pursuant to 42 Pa.CS §8143 and secures future advances pursuant to 42 Pa.CS §8143 and §8144. This Deed of Trust shall secure any and all present or future advances and readvances under the Liabilities made by. Mortgage releases. Easements.