QB Issue Resolution:

Some of those fields are used in different iif transaction formats, and the format determines what the field is used for.

 

Best option is download this iif kit, then in windows explorer click that folder and then each type of iif file can be double clicked to open the field definitions

 

this page, and scroll down to the section for IIF Import Kit

https://community.intuit.com/articles/1501233-iif-overview-import-kit-sample-files-and-headersiif-ov…

Resolution for Issue 'I want to clarify the meaning of the following fields in “Invoice (Sales Tax Preference=off).iif”. MEMO CLEAR REIMBEXP EXTRA INVITEM Could anyone tell me?' available: Yes (Solved).
Source: Intuit Community forum.

I want to clarify the meaning of the following fields in “Invoice (Sales Tax Preference=off).iif”. MEMO CLEAR REIMBEXP EXTRA INVITEM Could anyone tell me?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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