| Bundesliga 1989/1990 Upper Play-Off - Appearances as Referee |  |
 |
 |
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| 04/05/1990 | FC Tirol | - | SV Austria Salzburg | 5:2 | 6 | - | - |
| 14/05/1990 | Rapid Wien | - | First Vienna FC | 0:3 | 1 | - | 1 |
| Bundesliga 1989/1990 Upper Play-Off - Appearances as Referee | |
|
|
||||
| 04/05/1990 | FC Tirol | - | SV Austria Salzburg | 5:2 | 6 | - | - |
| 14/05/1990 | Rapid Wien | - | First Vienna FC | 0:3 | 1 | - | 1 |
| Complete name: | Heinz Prohaska |
| Born: | 26/04/1944 |
| Place of birth: |
Wien, 
Austria |
| Nationality: |
Austria |
| Profession: | Briefträger |