I have attached a component to an activity as stock item.
I have ensured the purchasing data for material (i have attached a master record):
1) Quantity, 2) UOM, 3) GL account, 4) Purch group and 5) Material group.
Even after this, i have experienced the message CN182 during release of activitiy:
"Activity 0080 cannot be released: Purchasing data is missing"