Create a new form code with no modification and try to print that and see what happens. Do you have third party add-ons? Was the previous form code modified? Fields added?

Open up Purchase Order Printing and Select the Form Code in question
Click The Designer Button (upper right) If no Designer button install Crystal Reports 2011 on the workstation.
From the Crystal Designer
Database | Set Datasource location
Note the datasource in the upper pane (Current Data Source)
In The Lower Pane (Replace with)
Select create new connection
Expand ODBC (RDO)
Scroll Down to SOTAMAS90
Click Finish
Enter Login Credentials
Highlight SOTAMAS90
Click Update Button (right side)
Click Close
Database | Verify Database
If unmapped fileds display map them
Save (If prompted to save as a new file name, the RPT is flagged as READ ONLY - change its properties in the operating system)

If this is Sage 100 Premium and the SOTAMS90 DSN is not listed please post back.
John Nichols
Sage