Retentions are calculated based on the Retention code entered in the Maintenance tab setup for this SubContract
Clicking the "Retention" button will calculate the retention value for this claim, on a subcontract to date basis.
The Retentions are deducted from Claims on the SubContract, and added to a cost balance on the retention job, defined in the Control File. A Job Enquiry on this job shows cost transactions for all the subcontract claim retentions.
When you hit the "Calc Retention" button it calculates the retention at the bottom of the screen. You can edit the figure for This Claim if required.
With the Client Contract you can see the Sales Code and the Retention Job with SubContracts, this all happens behind the scenes based on the Control File Parameters.