In Webgility Software follow below mentioned steps:

1). Navigate to Integrations> Stores> Advanced Settings. Click Clear, then click Save and Close.

2). Now go to Integrations> Get Latest Data & Settings

3). In the pop-up window, click Download Data. This may take several minutes if you have a lot of data in your QB-POS file.

4). Once this is complete you will be shown a message indicating that the download was successful.

5). Now go to Product> All Products (for Online store) select the filter for Mapped check for incorrect mappings and remove/delete them.

6). Once done try to post the order and it should work successfully.