concat function in EJB QL doesn't nest

I'm attempting to do a case insensitive search for a substring within the concatenation of two columns. The EJB QL I came up with looks like this:

where lower(concat(concat(e.firstname, ' '), e.surname))) like concat(lower(:name), '%')

however trying to execute that results in the following parse exception.

Caused by: <0.0.0 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: Encountered "lower ( concat ( concat ( e . firstname , \' \' ) , e . surname ) ) )" at character 32, but expected: ["(", ")", "+", ",", "-", ".", ":", "<", "<=", "<>", "=", ">", ">=", "?", "ABS", "ALL", "AND", "ANY", "AS", "ASC", "AVG", "BETWEEN", "BOTH", "BY", "CONCAT", "COUNT", "CURRENT_DATE", "CURRENT_TIME", "CURRENT_TIMESTAMP", "DELETE", "DESC", "DISTINCT", "EMPTY", "ESCAPE", "EXISTS", "FETCH", "FROM", "GROUP", "HAVING", "IN", "INNER", "IS", "JOIN", "LEADING", "LEFT", "LENGTH", "LIKE", "LOCATE", "LOWER", "MAX", "MEMBER", "MIN", "MOD", "NEW", "NOT", "NULL", "OBJECT", "OF", "OR", "ORDER", "OUTER", "SELECT", "SET", "SIZE", "SOME", "SQRT", "SUBSTRING", "SUM", "TRAILING", "TRIM", "UPDATE", "UPPER", "WHERE", <BOOLEAN_LITERAL>, <DECIMAL_LITERAL>, <IDENTIFIER>, <INTEGER_LITERAL>, <STRING_LITERAL>].
at org.apache.openjpa.kernel.jpql.JPQL.generateParseException(JPQL.java:9322)
at org.apache.openjpa.kernel.jpql.JPQL.jj_consume_token(JPQL.java:9199)
at org.apache.openjpa.kernel.jpql.JPQL.conditional_primary(JPQL.java:1895)
at org.apache.openjpa.kernel.jpql.JPQL.conditional_factor(JPQL.java:1873)
at org.apache.openjpa.kernel.jpql.JPQL.conditional_term(JPQL.java:1739)
at org.apache.openjpa.kernel.jpql.JPQL.conditional_expression(JPQL.java:1701)
at org.apache.openjpa.kernel.jpql.JPQL.where_clause(JPQL.java:1548)
at org.apache.openjpa.kernel.jpql.JPQL.select_statement(JPQL.java:90)
at org.apache.openjpa.kernel.jpql.JPQL.parseQuery(JPQL.java:62)
at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder$ParsedJPQL.parse(JPQLExpressionBuilder.java:1652)
... 50 more