This error may result from a comma at the end of the Item Description field, the Customer Name field or another field.. 

Make sure there are no users editing the customer master, entering customer orders or shipping items.

• Open Windows Explorer and go to the Mfgsys folder
• Open the Modcomsl.tmp file in WordPad and go to the last record
• Open the Modcomsl.fil file in WordPad
• Go to the record in Modcomsl.fil following the last record in the Modcomsl.tmp file which can be an ITMB record or a CUID record.
• Look at the item description and if there is a comma at the end of the description, remove it
• Save the file as Text Only and exit WordPad
• In Fourth Shift, go to the Customer Master (CUID or the customer master button in  Sales  Order Processing) Item Master (ITMB) screen and remove the trailing comma
• Delete the Modcomgl.mc file
• Delete the Modcomsl.tmp file
• Rename any modcom mcx files to mc 
• Run the applicable module communication process, such as APMC, IVMC or Load Daily Transactions.  Do not run GLMC yet.
• Run the Daily Allocation Tool (Interco.exe) again
• If you choose you may run APMC, GLMC, IVMC and move the Modcomsl.mc to the SAAM folder.  Or you can wait until the next nightly batch and records from the current day's processing will be appended to the mc files.