How to create a related field from a custom field

Question

Hi by using the *developer mode  *how can i create a related field from another custom field and here is my eg :

- i create a new custom field named ( object ) on *sale.order,* so  after creating an *invoice* i should find the same value for the ( object ).

i already made an a related field from another existing field ( name ) by adding  *partner_id.name on * *related field.*

But for a custom field i found some difficult on what i should put in the case of *Related field, * so i hope  that

Prakash · Accepted Answer

Related Fields Always create with the *Many2one* Fields.
so just ensure that custom fields should be *Many2one* in your case.
in sort  it should be like custom_field*_id* not custom_field_*ids*(12m or m2m)
NOTE: i am not saying that 12m and m2m can't be create as related field , i am saying  the *reference field * of related fields(either 12m ,m21 or m2m ) should always be the many2one ,* other wise it can lead to Singleton Error *
For more details Refer this image
http://prntscr.com/bajb7c

Ho

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But for a custom field i found some difficult on what i should put in the case of Related field, so i hope that the community help me to find the correct way thanks.

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