Message type: E = Error
Message class:  FOT_TDT -  
Message number: 075
Message text: Tax Rate must be 0% for non taxable Tax Code &1.
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message FOT_TDT075 indicates that there is an issue with the tax rate associated with a non-taxable tax code. Specifically, the error states that the tax rate must be set to 0% for the specified non-taxable tax code (denoted as &1).
Cause: This error typically occurs in the following scenarios: Incorrect Tax Code Configuration: The tax code being used is defined as non-taxable in the system, but it has been assigned a tax rate greater than 0%. Data Entry Error: During the entry of a transaction, the wrong tax code may have been selected, or the tax rate may have been incorrectly entered. Master Data Issues: The master data for the customer or vendor may have incorrect tax settings that do not align with the tax code being used.
Solution: To resolve this error, you can take the following steps: Check Tax Code Configuration: Go to the transaction code OBYZ (or use the path: SPRO > Financial
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
FOT_TDT074 Valid from date of tax code &1 is before valid from date in customizing.
What causes this issue?  Valid from date of a Tax Rate for the specified Tax Code <(>&<)>1, is before the Valid from date of the exist...
FOT_TDT073 Tax rate maintenance is not allowed in the P-System, display mode only
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FOT_TDT076 Providing Tax Calc. Date on line item level and in header is not allowed
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FOT_TDT077 Tax Calc. Date and Tax Calc. Date From must be filled on line item
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.