# [ref_impl_eiffel] [1541] Fix error where single-valued attribute nodes allowed addition of more than one sub-node . **Category:** [Reference Implementation: Eiffel (archive)](https://discourse.openehr.org/c/reference-implementation-eiffel-archive/161) **Created:** 2011-08-17 11:23 UTC **Views:** 1 **Replies:** 0 **URL:** https://discourse.openehr.org/t/ref-impl-eiffel-1541-fix-error-where-single-valued-attribute-nodes-allowed-addition-of-more-than-one-sub-node/14115 --- ## Post #1 by @svn1 Revision: 1541 Author: thomas\.beale Log Message: --- **Canonical:** https://discourse.openehr.org/t/ref-impl-eiffel-1541-fix-error-where-single-valued-attribute-nodes-allowed-addition-of-more-than-one-sub-node/14115 **Original content:** https://discourse.openehr.org/t/ref-impl-eiffel-1541-fix-error-where-single-valued-attribute-nodes-allowed-addition-of-more-than-one-sub-node/14115