Multicurrency query issue

[ddean2]

Hello,
I am using the LREngine code for 2 custom objects - master__c, detail__c, lookupfield__c

Our org uses multicurrency and when I was attempting to sum a currency field I got the following error:
System.QueryException: Didn't understand relationship 'Master__c' in field path. If you are attempting to use a custom relationship, be sure to append the '__r' after the custom relationship name.

This error occured in this section of code:
// Add a field selection to get the currency from the parent record if we are depositing values into a currency field
if(IsMultiCurrencyOrg() == true && needsCurrency == true){
String masterTblName = ctx.master.getDescribe().getName();
soqlProjection += ', ' + RollupOperation.Max + '(' + masterTblName +
'.' + CURRENCYISOCODENAME + ') ' + MASTERCURRENCYALIAS;
}
I believe the fix would be something like :
String relationshipFieldName = ctx.lookupField.getRelationshipName();
soqlProjection += ', ' + RollupOperation.Max + '(' + relationshipFieldName +
'.' + CURRENCYISOCODENAME + ') ' + MASTERCURRENCYALIAS;