Akashji
All the rules quoted above are different and have no co-relation with each other.
Noti no. 214/86 is in respect of movement of goods for job work purpose under cover of challan, with prior permission of the department but not related to any cenvat credit rules condition in any way. Intimation is required so that the department is aware about the job work activity undertaken and the parties for whom such job work is done.
Rule 4(5) (a) of Cenvat Credit Rules, 2004 is for the purpose of job work under cenvat credit rules and pertains to reversal of cenvat at time of removal of goods for such job work and availment again of the cenvat credit at time of receipt of the said job worked goods. If job work goods are not received back in 180 days, then this rule is the most dangerous rule under job work.
Rule 16 is regarding finished goods received back in the factory premises for specific purpose as detailed under the said rule and is not related to job work. Permission of the Honourable Commissioner under rule 16 of Central Excise Rules, 2002 is required only if there is any difficulty in following the said rule and generally not required in normal course..
All above rules are of utmost importance and backbone of excise laws and rules.