I'm afraid you will need to round the lot size value before closing the trade partially. I remember a problem like this a long time ago and I don't remember there was a solution for it. But my memory is not as good as before, obviously. 
Posts made by l'andorrà
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RE: Partial closure on MT5 doesn't round lot size to a valid valueposted in Bug Reports
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RE: I have a project looking forward to your helpposted in Questions & Answers
Can you please define 'touches' and 'reaches'. Are theyu different actions or conditions. If so, whch settings (high, low, close, open price levels) are applicate to both of them?
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RE: Need help with order opening when my indicator draws arrows!posted in Questions & Answers
Could you please open a new thread instead of retaking this old one? Additionally, sharing the indicator would help.
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RE: about open reverse order with multiply lot size from previous tradeposted in Questions & Answers
Can you please create a new thread instead of retaking this old one? And sharing your current project would also be appreciated.
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RE: How to a percentage area for orderposted in Questions & Answers
For your first question you can try this for a sell:

I specified that the high of candle ID 1 was above the BB whereas the close was below it. Maybe you wanted the low. Just use it as a suggestion.
For your second question I recommend you to use the block called 'bear candle'. Yoy can also specify it to be candle ID 1. That way both conditions will be required for your sell to be launched.
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RE: multiple strategies in 1 EAposted in Questions & Answers
Defining groups. Each strategy should be specified a different group number. That way all of them will be active at the same time.
https://fxdreema.com/instructions/builder/groups-and-magic-numbers
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RE: How to a percentage area for orderposted in Questions & Answers
Some additional explanation would help. Can you please describe what do you exactly need?
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RE: how to use the "aplly on previos indicator" & "apply on first indicator" Using standard indicators in 1 indicator window?posted in General Discussions
That cannot be done in fxDReema. You will need a custom indicator doing that instead and then upload it to your fxDreema account.
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RE: If you have successfully used pipfinite pro trend in your EA, please come to my rescue dicatorposted in Questions & Answers
Can you please share the mq4 version of the indicator?
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RE: I have a project looking forward to your helpposted in Questions & Answers
I see you indicator dras rectabgles. What do you exactly mean by 'hitting' the resistance? Crossing the whole rectangle? Crossing just one side? If so, how much?
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RE: Conflict EA between two different chartposted in Bug Reports
You can also specify each EA working on one chart only. Use 'specified' option on all display menus of all blocks. Check that no block has 'Any symbol' option selected.
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RE: What is the meaning of this symbol: ==, >=, <=, != ?posted in Questions & Answers
This is the ex4 version. Can you please share the mq4 version?
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RE: I have been trying convert the custom indicator to EA. Will appreciate your help.posted in Questions & Answers
Agreed. A new thread is required for this.
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RE: Ayuda apertura con la misma condicion en distinto diaposted in Questions & Answers
Eso que pides ya es más complejo. La única forma de abrir múltiples operaciones cada vez que se den las condiciones es eliminando el bloque 'No trade'. De ese modo se abrirán tantas operaciones como veces se cumplan las condiciones.
Otra cos bien diferente es lo de la modificación del SL. ¿Por qué se debe modificar al día siguiente?
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RE: After TP, new pending orderposted in Questions & Answers
Probably you should use the 'On Trade' tab to do that, but Xfire is right. Can you please share your project?
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RE: Please kindly Help - Pipfinite Pro Trend custom indicatorposted in Questions & Answers
I'm afraid programming is not my field of expertise, sorry. Maybe roar or miro?