The following applies ONLY to Sage MAS 90 and MAS 200 version 4.1:

Service Update 4.1.0.4 for Sage MAS 90 and MAS 200 version 4.1 had several Sales Order and Accounts Receivable issues, which have been resolved in Service Update 4.1.0.5. To check which version is on your system, select File, Run and type in “*info” (without the quotes). The System Version field will tell you. If it says 4.1.0.4 or lower, you should download the latest Service Update from the Sage Support site and install it.