SAP Note 14884 - Date error during materials planning

Symptom:

When executing a materials planning (no matter if single planning or total planning, you receive the error message 61061 :
Date 00.00.0000 is before valid factory calendar (Please correct)

Cause and prerequisites

For a material with goods receipt processing time, there is an order for which the date has not been maintained (starting date, completion date, and so on).

Solution
Look at all orders and delete the defective one or enter the corresponding date.

Key words: MD01 MD02 MD03 Material requirements planning