Improvements to SCV program to calculate Routing Effective Dates

Previously, when discontinued materials or operations existed in an alternative routing, the TFORM_ROUTING_EFFECTIVE_DATE program generated additional routings with incorrect effective dates.

The program is now improved to exclude discontinued materials and operations from the distinct effective date calculation. In addition, only explicitly mentioned effective dates are used in the same calculation. This makes output items with no explicit effective dates valid only within the validity of the routing header, preventing additional valid periods with effectivity starting from the default start date (1999) or ending at the default end date (2037).

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