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<p>You can use processing algorithm "refactor fields" on the
layer(s) that have fields to be changed. This operation will give
you a temporary file/layer the same number of columns and -names
as the original layer, but with column type(s) redefined by you.
<br>
</p>
<p>Afterwards you can merge the temporary file/layer with the other
layers</p>
<p>Just be sure to have the latest (functioning) version of QGIS
installed: 3.16.3. From the error message you included, I suspect
you have an older version of QGIS installed. I tried to merge 2
layers using QGIS 3.16.3 and the result was a new layer that
contained the merged layers. If there was a data discrepancy the
result values were null's (but no run-time errors)<br>
</p>
<pre class="moz-signature" cols="72">Med venlig hilsen / Kind regards
Bo Victor Thomsen</pre>
<div class="moz-cite-prefix">Den 12-03-2021 kl. 10:04 skrev
Springfield Harrison:<br>
</div>
<blockquote type="cite"
cite="mid:6b934243-a326-70ba-6a7c-c79ed96b5146@gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Thanks Bo,</p>
<p>I tried a sample run but it failed:</p>
<p><span style=" color:#ff0000;">"TAG field in layer Tree Table
All 2 PntType has different data type than in other layers
(String instead of integer)</span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span
style=" color:#ff0000;">Execution failed after 1.20 seconds"</span></p>
<p>It looks like it can't handle differing data types and won't
offer choices for merging fields. I wonder if there are other
tools?</p>
<p>Thanks again . . . .<br>
</p>
<pre class="moz-signature" cols="72">-----
Cheers, Spring</pre>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 12/Mar/2021 00:48, Bo Victor
Thomsen wrote:<br>
</div>
<blockquote type="cite"
cite="mid:0fa4b069-1b7d-9b04-23a0-1da3e244cbb0@gmail.com">Menu
"Vector" -> "Data management tools" -> "Merge vector
layers" <br>
<br>
Med venlig hilsen / Kind regards <br>
<br>
Bo Victor Thomsen <br>
<br>
Den 12-03-2021 kl. 09:35 skrev Springfield Harrison: <br>
<blockquote type="cite">t shapefile) of trees to which I n <br>
</blockquote>
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