I'm testing the Odoo 9 version and I see this error when displaying the reports of supplier invoices:

...

File "/home/usuario/workspace/odoo9/openerp/addons/base/ir/ir_ui_view.py", line 635, in read_combined

view_arch = etree.fromstring(view['arch'].encode('utf-8'))

File "lxml.etree.pyx", line 3092, in lxml.etree.fromstring (src/lxml/lxml.etree.c:70473)

File "parser.pxi", line 1828, in lxml.etree._parseMemoryDocument (src/lxml/lxml.etree.c:106307)

File "parser.pxi", line 1716, in lxml.etree._parseDoc (src/lxml/lxml.etree.c:105098)

File "parser.pxi", line 1086, in lxml.etree._BaseParser._parseDoc (src/lxml/lxml.etree.c:99780)

File "parser.pxi", line 580, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:94254)

File "parser.pxi", line 690, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:95690)

File "parser.pxi", line 620, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:94757)

QWebException: Entity 'oacute' not defined, line 25, column 46

any idea what happens, regards.