for a custom data dictionary, some fields are generated twice, and so compilation fails with XY.java: get(quickfix.field.Currency) is already defined in quickfix.fix44.XY

Steps to reproduce:
1. Take the - probably relatively often used - datadictionary from http://www.fxprogrammers.com/apisupport/FXCM_FIX.zip (wich is officially published in http://forexforums.dailyfx.com/fix-api-support/453300-fix-documentation-subscribe-updates-2.html)
2. copy the file FIXFXCM10.xml from this zip and to core/src/main/resource/FIX44.xml
3. run "ant clean jar"
Then you (at least I) get 100 errors like this:

[javac] Compiling 1924 source files to /home/hk/ws/e/quickfix-1.5.2/core/target/classes/main
[javac] Advertisement.java:1886: set(quickfix.field.Currency) is already defined in quickfix.fix44.Advertisement
[javac] public void set(quickfix.field.Currency value) {
[javac] ^
[javac] Advertisement.java:1890: get(quickfix.field.Currency) is already defined in quickfix.fix44.Advertisement
[javac] public quickfix.field.Currency get(quickfix.field.Currency value)
[javac] ^
[javac] Advertisement.java:1897: getCurrency() is already defined in quickfix.fix44.Advertisement
[javac] public quickfix.field.Currency getCurrency() throws FieldNotFound {
[javac] ^
[javac] Advertisement.java:1904: isSet(quickfix.field.Currency) is already defined in quickfix.fix44.Advertisement
[javac] public boolean isSet(quickfix.field.Currency field) {
[javac] ^
[javac] Advertisement.java:1908: isSetCurrency() is already defined in quickfix.fix44.Advertisement
[javac] public boolean isSetCurrency() {
[javac] ^
[javac] AllocationInstruction.java:2997: set(quickfix.field.Currency) is already defined in quickfix.fix44.AllocationInstruction
[javac] public void set(quickfix.field.Currency value) {
[javac] ^
[javac] AllocationInstruction.java:3001: get(quickfix.field.Currency) is already defined in quickfix.fix44.AllocationInstruction
[javac] public quickfix.field.Currency get(quickfix.field.Currency value)
[javac] ^

The problem is, that these methods are really generated twice. I've no idea how this might happen.

Any ideas?
Thank you very much,
Heiko Seebach