Update EMIP00001.xml

BetaMasaheft/Documentation#2611 @Ralph-Lee-UK FYI

EMIP/1-1000/EMIP00001.xml

@@ -392,7 +392,7 @@ type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?><TEI
                       </item>
                         <item xml:id="e4">
                         <locus target="#iv(erso)" facs="002"/>
-                        <desc>pen trial, <date calendar="ethiopian" when="1943"> <foreign xml:lang="gez">መጋቢት፡</foreign> 12, [19]43 EC (March 21, 1951 CE)</date></desc>
+                        <desc>pen trial, <date calendar="ethiopian" when-custom="1943" when="1951"> <foreign xml:lang="gez">መጋቢት፡</foreign> 12, [19]43 EC (March 21, 1951 CE)</date></desc>
                       </item>
                         <item xml:id="e5">
                           <locus target="#ir(ecto) #iir(ecto) #iiiv(erso) #176v #177r #177v" facs="001 002 004 180 181"/>