Topic

Sage 50

Sage 50 (US Peachtree and Canadian Simply Accounting) conversions, editions, and downgrades. 36 guides and 425 answers on this topic.

AnswerSage 50

Cannot delete the Account because there is a non-zero balance in some period(s)

Sage 50 blocks you from deleting a chart-of-accounts account that still carries a balance in any accounting period, past or current.

Updated August 13, 2026

AnswerSage 50

Cannot delete this invoice as a check has been applied to this invoice

Sage 50 blocks invoice deletion when a payment check is linked to it; you must remove the link first or void instead.

Updated August 13, 2026

AnswerSage 50

Cannot start a new transaction since you are already in a transaction

Sage 50 is holding an open transaction lock and will not let you begin another entry until that lock is released or cleared.

Updated August 13, 2026

AnswerSage 50

Customers with sales orders, invoices, or credit memos cannot be converted to prospects

Sage 50 blocks you from changing a customer back to a prospect when open or historical sales transactions are tied to that customer record.

Updated August 13, 2026

AnswerConversion

Do Sage 50 assembly and bill-of-materials items convert to QuickBooks?

Assembly items and BOMs can generally be mapped to QuickBooks Inventory Assembly items, but component lists and build history may need manual review.

Updated August 13, 2026

AnswerSage 50

Item cannot be changed" when editing a line used on an invoice in Sage 50

Sage 50 blocks edits to an item or line that already appears on a saved invoice with a non-zero quantity or amount.

Updated August 13, 2026

AnswerSage 50

Master stock item can not be used on a transaction" — Sage 50 error

Sage 50 blocks a master or template stock item from being placed directly on an invoice, PO, or other transaction because it is not a sellable item.

Updated August 13, 2026

AnswerSage 50

Not a Sage 50 form, or it may have been corrupted" error explained

Sage 50 cannot read the form file you selected, usually because the format is wrong or the file is damaged.

Updated August 13, 2026

AnswerSage 50

Phase record number of the transaction line is not valid" (Sage 50)

Sage 50 is reporting internal data corruption in a transaction line, usually meaning the file has structural damage needing repair.

Updated August 13, 2026

AnswerSage 50

Referenced Customer or Vendor cannot be changed" — Sage 50 error

Sage 50 blocks you from changing a customer or vendor name on a transaction that is already linked to other posted entries.

Updated August 13, 2026

AnswerSage 50

Sage 50 "costing method cannot be changed once inventory items have been converted

Sage 50 locks your inventory costing method after any item is converted, preventing a switch between FIFO, average, or LIFO.

Updated August 13, 2026

AnswerSage 50

Sage 50 "duplicate reference number" error when saving a transaction

Sage 50 is blocking your save because the reference field matches a transaction already in the file, even when the two are unrelated.

Updated August 13, 2026