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