SAP Note 28752 - Req.setup for schedule line w/o relevance to reqs. Note 28752 - Req.setup for schedule line w/o relevance to reqs.

Symptom:

For schedule lines that are not relevant to requirements but that check availability, a requirement is set up when you set a requirement relevant delivery block.

Cause and prerequisites

Schedule line without requirement relevance but with availability check.
Requirement relevant delivery block.
Sales order type without delivery and transportation scheduling.

Solution
Source code corrections