Error message when you perform a mail merge operation in Word: "Word found locked fields during update"

When you perform a mail merge operation in Microsoft Word, you may receive the following error message:

This behavior occurs when the following conditions are true:

• A {SHAPE \* MERGEFORMAT} field is included in your mail merge main document. This field is created when a text box or an AutoShape is added, with a drawing canvas, to the mail merge main document.
  
  NOTE: To see the fields contained in your document, press ALT+F9.
• The wrapping style of the drawing canvas is set to In Line With Text.

To work around this issue, use one of the following methods.

Method 1: Turn Off Drawing Canvas When You Insert AutoShapes

To prevent Word from automatically creating a drawing canvas when you insert AutoShapes, follow these steps:

1. On the Tools menu, click Options.
2. In the Options dialog box, click to clear the Automatically create drawing canvas when inserting AutoShapes check box on the General tab.

Method 2: Change the Wrapping Style

To change the wrapping style of the drawing canvas, follow these steps:

1. Click the drawing canvas.
   
   Notice that the Drawing Canvas toolbar appears.
2. On the Drawing Canvas toolbar, click Text Wrapping, and then click any wrapping style other than In Line With Text.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.