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You have duplicate Stock Codes on both the sheets.<br />
To check this, select the column A --&gt; Conditional Formatting --&gt; Highlight Cells Rules (first option) --&gt; Duplicate Values --&gt; OK.<br />
<br />
Do this on both the sheets and you will find the the duplicate stock codes get highlighted in both the sheets.<br />
<br />
To deal with this scenario, copy the Stock Codes from the Supplier Sheet (assuming this sheet has all the possible Stock Codes) and paste them to a New Sheet in cell A2, name that sheet as Stock_Codes and place a header in A1 as Stock_Code. <br />
Now on Stock_Code sheets select all the Stocks --&gt; Data Tab --&gt; Remove Duplicates, this will leave only unique stock codes on this sheet, now apply the Table style for the data on this sheet by pressing Ctrl+T and name the table from Table1 to something meaningful like tblStock_Codes.<br />
<br />
Add this table into the Data Model and in the diagram view you can create a Relationship between the three tables where tblStock_Codes will have the unique stock codes.<br />
<br />
Hope this helps.
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I've done this several times but am still getting the same error msg.<br />
<br />
Please could you have a look at the supplier sheet (attached) to check for duplicate stock codes and delete these rows<br />
<br />
Thanks<br />
<a href="https://filedb.experts-exchange.com/incoming/2016/04_w16/1091627/jan-mar.xlsx" target="_blank" class="file-inline" title="jan-mar (2.2 MB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>jan-mar.xlsx</a>
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jan-mar.xlsx

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Brilliant, now I see what you mean!
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No problem, <br />
<br />
I don't no if this question would interest you? It relates to the same project.<br />
<br />
<a href="https://www.experts-exchange.com/questions/28939506/Power-Pivot-SKU-by-Customer-by-Rank-DAX-Measure.html" rel="ugc nofollow">https://www.experts-exchange.com/questions/28939506/Power-Pivot-SKU-by-Customer-by-Rank-DAX-Measure.html</a>
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<div class="content wysiwyg-content">
Attached is an excel document with two tables loaded into a power pivot data model. I am trying to create a relationship between the stock code field in each table. I have used conditional formatting to check for duplicates in the supplier table stock code column and can't find any. Yet when I try and create a relationship I am getting the many-to-many error.<br />
<br />
Can anyone double check for me, perhaps I'm missing something.<br />
<br />
Rob<br />
<a href="https://filedb.experts-exchange.com/incoming/2016/04_w16/1091436/jan-marEE.xlsx" target="_blank" class="file-inline" title="jan-marEE.xlsx (1.9 MB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>jan-marEE.xlsx</a>
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</div>


jan-marEE.xlsx

Attached is an excel document with two tables loaded into a power pivot data model. I am trying to create a relationship between the stock code field in each table. I have used conditional formatting to check for duplicates in the supplier table stock code column and can't find any. Yet when I try and create a relationship I am getting the many-to-many error.

Can anyone double check for me, perhaps I'm missing something.

Rob

Power Pivot - Can't create relationship - No dublicates???

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.