First : How to post xml code? codeblocks and nomral text will crash the xml parts of my post, so I deleted first bracket
Here you go-full code for every part involved:
Form where enter SAPNumber:

recordid="esc_ship_spares_form_view"model=""\ rel="ugc">ir\.ui\.view">
\	fieldname="name">esc_ship_spares_form_view/field>
\	fieldname="model">esc\.ship\.spare/field>
\	fieldname="arch"type="xml">
\	formaction_buttons="false">
\	Buttonname="get_sap_no"string="GetData"type="object"class="oe_highlight"/>fieldname="order_id"/>
\	/form>
\	/field>
/record>

defget_sap_no\(self\):
\	​\#ifself\.order_id:
\	​\#Wesearchfororder_idtogetthecustomers_id
\	​sst=self\.env\['esc\.sst'\]\.search\(\[\('order_id','=',self\.order_id\)\],limit=1\)
\	​\#raiseValidationError\(sst\.partner\)
\	​view=self\.env\.ref\('mymodule\.esc_ship_spares_kanban_view_filtered'\)
\	​action=\{
\	​\	​'type':'ir\.actions\.act_window',
\	​\	​'res_model':'esc\.sst',
\	​\	​'view_type':'kanban',
\	​\	​'view_mode':'kanban',
\	​\	​'view_id':view\.id,
\	​\	​'domain':\[\('partner','=',sst\.partner\)\],
\	​\	​'target':'inline',
\	​\	​'context':\{
\	​\	​'partner':sst\.partner
\	​\	​\}
\	​\}
\	​returnaction

The\ Kanban\ is\ extended\ with\ a\ js_class\ for\ custom\ button\ \(below\ kanban\)

recordid="esc_ship_spares_kanban_view_filtered"model=""\ rel="ugc">ir\.ui\.view">
\	​fieldname="name">esc_ship_spares_kanban_view/field>
\	​fieldname="model">esc\.sst/field>
\	​fieldname="arch"type="xml">
\	​kanbangroup_create="false"default_group_by="service_state">
\	​\	​fieldname="order_id"/>
\	​\	​fieldname="partner"/>
\	​\	​fieldname="service_state"/>
\	​progressbarfield="service_state"colors='\{"eingang":"danger","verzug_1":"warning","verzug_2":"warning","erledigt":"success"\}'/>
\	​templates>
\	​tt\-name="kanban\-box">
\	​divclass="oe_kanban_content">
\	​divclass="o_kanban_record_title">
\	​strong>
\	​fieldname="order_id"/>\-\-\-\-\-fieldname="sst_date"/>
\	​/strong>
\	​br>/br>
\	​Artikel:fieldname="spare_no"/>
\	​br>/br>
\	​fieldname="spare_descr"/>
\	​br>/br>
\	​fieldname="fk_status"/>
\	​/div>
\	​/div>
\	​\	​divclass="oe_kanban_footer_right">
\	​/div>
\	​/t>
\	​/templates>
\	​/kanban>
\	​/field>
/record>

JS:

odoo\.define\('mymodule\.kanban_close_button',function\(require\)\{
"usestrict";
\	​var\ KanbanController=require\('web\.KanbanController'\);
\	​var\ KanbanView=require\('web\.KanbanView'\);
\	​var\ viewRegistry=require\('web\.view_registry'\);
\	​var\ KanbanCloseButton=KanbanController\.extend\(\{
\	​buttons_template:'mymodule\.closebutton',
\	​events:_\.extend\(\{\},KanbanController\.prototype\.events,\{
\	​'click\ \.close_sst_case':'_CloseSAPCase',
\}\),

_CloseSAPCase:function\(\)\{
\	​var\ self=this;
\	​alert\(this\.partner\)
\	​this\._rpc\(\{\	​\	​
\	​model:'esc\.sst',
\	​method:'write_tch_order',
\	​args:\[\],
\	​\	​\},\{
\	​shadow:true,
\	​\}\);

\	​\}
\	​\}\);

var\ close_caseKanbanView=KanbanView\.extend\(\{
config:_\.extend\(\{\},KanbanView.prototype.config,{
Controller:KanbanCloseButton
}),
});
viewRegistry.add('PutSAP',close_caseKanbanView);
});

qweb template for button:


templatesid="template"xml:space="preserve">
	​tt-extend="KanbanView.buttons"t-name="mymodule.closebutton">
	​	​tt-jquery="button"t-operation="replace">
	​	​buttont-if="widget.modelName=='esc.sst'"
	​	​class="btnbtn-primaryclose_sst_caseoe_highlight"
	​	​type="button">Auftragabschließen/button>
	​	​/t>
	​/t>
/templates>

defwrite_tch_order(self):
#ship_em=self.env['esc.sst'].search([('service_state','=','versenden')])
#sst_partner=ship_em[0].partner
#self.sst_state_changes(sst_partner)
#forsstinship_em:
#...

raiseValidationError(self.partner)

So whats wrong, please?

, you can get the ids of Kanban cards by using the search() method on the model that represents the Kanban cards. For example, if the model is called project.task, you could use the following code to get the ids of all Kanban cards:

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from odoo import models

task_ids = models.execute_kw('project.task', 'search', [[]])

This will return a list of all task ids. If you want to filter the tasks based on some condition, you can pass a domain as the first argument to the search() method. For example, to get the ids of all Kanban cards with the status "Done", you could use the following code:

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task_ids = models.execute_kw('project.task', 'search', [[['state', '=', 'done']]])

You can also use the ORM API to get the ids of Kanban cards, like this:

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task_obj = self.env['project.task']

task_ids = task_obj.search([])

Also, you can use the ORM API to filter the ids of Kanban cards, like this:

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task_obj = self.env['project.task']

task_ids = task_obj.search([('state','=','done')])

Please note that this is just an example, and the exact code may vary depending on the specific version of Odoo and the customizations that have been made to the system