EDI: Syntax error in IDoc (too many repetitions of a segment)

I am creating an idoc which is a list of

country code,plant,matnr,quantity.

I have created a custom segment for this.

While creating an idoc I am putting this line in the same segment i.e.

t_edidd-segnam = 'TESTIDOC'.

t_edidd-sdata = zsegment.

t_edidd-segnum = count_seg.

t_edidd-psgnum = 0.

t_edidd-hlevel = 1.

The idoc is being created but I am getting errors as

Get details from previous status records with status 26

and

EDI: Syntax error in IDoc (too many repetitions of a segment)

How this type of idocs are created?