Method 1: Project sales order

• Item transactions are consumed when the customer project invoice is posted.
• Always billable to the customer, no possibility to set it to non chargeable.
• Possibility of partial deliveries.
• Only possible for time and material projects.
• Missellaneous charges functionality available.
• Discount functionality with trade agreements available.
• Planned issue, so net requirements will decrease upon posting the consumption.

Method 2: Inventory journal

• Item transactions are consumed when the journal is posted.
• Possible to set it as non chargeable, hence not invoicing it to the customer.
• Partial deliveries not possible.
• Possible for all project types.
• Missellaneous charges functionality not available.
• Discount functionality with trade agreements not available.
• Unplanned issue, so net requirements will not decrease upon posting the consumption.

Method 3: Project item requirement

• Item transactions are consumed when the packing slip is updated.
• Possible to set it as non chargeable, hence not invoicing it to the customer.
• Possibility of partial deliveries.
• Possible for fixed-price and time and material projects.
• Missellaneous charges functionality not available.
• Discount functionality with trade agreements not available.
• Planned issue, so net requirements will decrease upon posting the consumption.

Method 4: Purchase order

• Item transactions are consumed on a packing slip update or when the customer or vendor is invoiced. It depends how the purchase order was created: see my post Purchase orders in project management.
• Possible to set it as non chargeable, hence not invoicing it to the customer.
• Possibility of partial deliveries.
• Possible for all project types.
• Missellaneous charges functionality available.
• Discount functionality with trade agreements available.