How to import parent child hierarchy in jira datacenter

[Rajat Krishnan]

Hello,

I am trying to import a custom issue type called Workpackage and Activity where Workpackage is parent and Activity is child (also defined in hierarchy configuration under advanced roadmap)

Now here is my csv import file 

Issue key	Issue Type	Summary	Custom field (Parent Link)
QUOTE1-130	Activity	Sample Activity 1	QUOTE1-129
QUOTE1-129	Workpackage	Sample Workpackage 1
QUOTE1-101	Activity	Activity
QUOTE1-66	Workpackage	Workpackage tryout level 1

Now while importing here is my mapping

Issue key - issue ID

Issue Type -Issue Type

Summary -  Summary

Custom field (Parent Link) - Parent ID

but on import, it imports everything except the relationship i.e. expectation is that QUOTE1-130 should come under QUOTE1-129 as child issue but it does not come

My Environment:

Jira v10.0.3 Datacenter

Please let me know what wrong i am doing here

Thanks in advance!!