The two most common sources of error in differentiated quotations are: first, "changed this customer's terms but forgot about that one," and second, "verbally agreed conditions were never documented in the official quotation." A more robust approach is to set up each customer's price tiers, payment terms, currency, and minimum order quantities in advance, then have the quotation system pull those values automatically rather than requiring manual entry each time. Keep a PDF copy of every version sent out. When both parties exchange modifications, you can directly compare versions using a diff view instead of relying on memory to confirm what changed. For new customers where no relationship is established yet, you can set up a separate public entry point that displays standard terms, giving them an inquiry channel without exposing your complete pricing structure.