This enumeration determines prioritized list of patch code types dictating the order in which patch codes will be sought.
Values:
| IG_TW_PCH_PATCH1 | Patch 1 |
| IG_TW_PCH_PATCH2 | Patch 2 |
| IG_TW_PCH_PATCH3 | Patch 3 |
| IG_TW_PCH_PATCH4 | Patch 4 |
| IG_TW_PCH_PATCH6 | Patch 6 |
| IG_TW_PCH_PATCHT | Patch T |